C, highest row 4 black + 8 red middle row 6 black + 6 red lowest row probably 8 black + 4 red
left column 4 black + 8 red middle column 6 black + 6 red right column probably 8 black + 4 red
diagonal1 6+6 diagonal2 6+6

When looking at the shapes only, there are 3 of each kind so the answer is either c or d. When only looking at the colors of the inner shapes, there are no inner shapes having another inner shape to the left right above or below with the same color wich rules out d.
c is the answer

Set X to half of what Mia can do in a day, then in one day Mia can do 2X and Emily 3X, for a daily total between them of 5X; the total task, which takes both of them 24 days, is 120X. Working alone, then, Mia could do it in 60 days or Emily in 40.

Emily does 3/5 of the work in 24 days, so it would take her 40 days to do the whole. Mia does 2/5 of the work in 24 days, so it would take her 60 days to do the whole.

Obiwan, the point of having different roads is that they won’t have a head-on collision half way around. I don’t think sphericity would matter, since both cars would have essentially the same handicap on average. I like your point about tidal forces, though; having one of the cars stay under the moon would definitely be both feasible and significant.

To the left of the woman in the red skirt, under the couple walking and to the right of the girl with the hoop the face is formed by the colour of the road. Its upside down so turning the picture over 180 degrees makes it easier to see.

The official answer I had relates to what Obiwan says in 4a: more friction related wear in the car traveling against the direction of earth rotation (more downward force).

Joe, Andy,and Obiwan however, raise other variables that could play potentially a more important role!

Seems like too many potential variables unless there is a trick answer…
1. Is there significant to “and are on different roads”? I assume not, but it is a
curious statement.
2. Are we to assume the “new earth” is a perfect sphere?
3. Weather variations are gone because oceans are gone?
4. Variables to think about:
a) Miniscule differences in downward forces related to travel with versus against
direction of earth rotation?
b) Relationship to sun–tilted axis of rotation leading to more or less sun exposure, change in tire pressure related to more sunlight–>less wear in the car that has higher average tire pressures?
c) Greater reduction in gravitation pull related to moon’s influence?

This is probably an easy question for a geophysicist…

In re: my previous comment, I made a mistake. At the equator, where our (fictional) cars are, the prevailing winds are the trade winds out of the east, which would help the westbound car and make the eastbound one wear out its tires faster.

Still, my previous comment stands. We don’t know what the prevailing winds would be on a smooth ocean-free world, and so we don’t know enough to answer the question.

There’s not really enough information for a good answer. Currently existing production cars will spend as much time in daylight as dark, so sunlight will average out and not be a factor. On the other hand, if we postulate 1000 mph cars, this isn’t true, and the answer depends on whether or not the westbound car is always in sunlight; if so, the warmer roads will wear out the rubber tires faster.

The other factor that might might make a difference is prevailing winds which, in the real world, are mostly west to east and would make the westbound car work harder (and therefore wear out its tires faster). But would that still be true on a smooth ocean-free Earth? I doubt that we know.

If we assume the cars will travel along the equator and that the drivers have enough water to live on, on this new harsh Earth, then the only thing I can think of is the fact that the car travelling West will spend more time in daylight, and therefore more sun and more heat. And this causes more tire wear.
Why does it spend more time in daylight? Well say the Earth rotates at about 1000mph along the equator, if the car also travelled West at that speed it would be constantly in the sun. It probably won´t travel that fast but any fraction of it will still mean it spends more time in the hotter tire wearing part of the day. The other car will spend relatively more time in the cooler nights.

## Teeter-Totter Balance Puzzle

S | BBENG| Guest December 15th, 2013 - 10:49 am says[…] from http://www.smart-kit.com/s949/.....ce-puzzle/ […]

## Seasonal Challenge

RK| Founder | Profile December 8th, 2013 - 9:52 pm saysThanks engjs1960! Corrected

## Green Triangles with Some Math

hamidarabi| Profile December 8th, 2013 - 12:24 pm says6+2+?+3 = 20

x=20-11

x=9

?+3+4+2=18

x=18-9

x=9.

## Green Triangles with Some Math

hamidarabi| Profile December 8th, 2013 - 12:22 pm says9

## Liquid Measure

Mäng | 6.klassi blogi| Guest December 8th, 2013 - 7:20 am says[…] http://www.smart-kit.com/s8738.....#038;#8230; […]

## Green Triangles with Some Math

ma.dbqn| Profile December 7th, 2013 - 10:38 am says9

## Seasonal Challenge

engjs1960| Profile December 7th, 2013 - 7:53 am sayscharm, match, cram, air, hit, mirth, rash, mass (should be 7459 miss) => Christmas.

## Seasonal Challenge

joe| Profile December 4th, 2013 - 9:42 am saysits CHRISTMAS !!!

## Seasonal Challenge

John Lewis Highsmith| Profile December 2nd, 2013 - 12:43 pm saysThe word is “Christmas”.

## Seasonal Challenge

Obiwan| Profile December 1st, 2013 - 11:15 pm saysChristmas

## A Company Plant

A Gift of a Word Puzzle | Smart-Kit Puzzles and Games| Guest December 1st, 2013 - 10:53 pm says[…] Not sure how to solve this? Check out a similar challenge here! […]

## 9 Boxes

someone1994| Profile December 1st, 2013 - 4:01 pm saysC, highest row 4 black + 8 red middle row 6 black + 6 red lowest row probably 8 black + 4 red

left column 4 black + 8 red middle column 6 black + 6 red right column probably 8 black + 4 red

diagonal1 6+6 diagonal2 6+6

## Matrix Puzzle- Triangles & Rectangles

someone1994| Profile December 1st, 2013 - 12:13 pm saysWhen looking at the shapes only, there are 3 of each kind so the answer is either c or d. When only looking at the colors of the inner shapes, there are no inner shapes having another inner shape to the left right above or below with the same color wich rules out d.

c is the answer

## A Piece of Work

andy75043| Profile November 15th, 2013 - 1:49 am saysSet X to half of what Mia can do in a day, then in one day Mia can do 2X and Emily 3X, for a daily total between them of 5X; the total task, which takes both of them 24 days, is 120X. Working alone, then, Mia could do it in 60 days or Emily in 40.

## A Piece of Work

engjs1960| Profile November 12th, 2013 - 3:33 am saysEmily does 3/5 of the work in 24 days, so it would take her 40 days to do the whole. Mia does 2/5 of the work in 24 days, so it would take her 60 days to do the whole.

## Liebig Hidden Object Card

brainsight| Profile November 7th, 2013 - 3:07 pm saysno where

## Where is the Astronomer?

brainsight| Profile November 7th, 2013 - 3:05 pm saysin the jar

## The Man in the coffee beans: Can you find him?

The Man in the Coffee Beans | Smart-Kit Puzzles and Games| Guest November 3rd, 2013 - 9:29 pm says[…] In any case, many of you will enjoy one of the earlier picture puzzles posted up here on Smart-Kit: The Man in the Coffee Beans. Can yo… […]

## 2 Liebig Hidden Object Cards

The Man in the coffee beans: Can you find him? | Smart-Kit Puzzles and Games| Guest November 3rd, 2013 - 9:11 pm says[…] 2) Where are the 3 boys? […]

## Identical Cars

andy75043| Profile October 29th, 2013 - 1:55 pm saysObiwan, the point of having different roads is that they won’t have a head-on collision half way around. I don’t think sphericity would matter, since both cars would have essentially the same handicap on average. I like your point about tidal forces, though; having one of the cars stay under the moon would definitely be both feasible and significant.

## Hidden Object, Where is the Officer?

engjs1960| Profile October 26th, 2013 - 1:28 pm saysFacing right, the dark patch looks like a peaked cap. But I think it’s just Pareidolia. :-)

## Hidden Object, Where is the Officer?

RK| Founder | Profile October 26th, 2013 - 11:21 am saysI had difficulty with this one, but I like joe’s find!

engjs1960- after turning the card upside down, I still had trouble seeing this?

## Hidden Object, Where is the Officer?

engjs1960| Profile October 21st, 2013 - 3:24 am saysUpside down near the soldier’s foot.

## Hidden Object, Where is the Officer?

joe| Profile October 20th, 2013 - 1:12 pm saysTo the left of the woman in the red skirt, under the couple walking and to the right of the girl with the hoop the face is formed by the colour of the road. Its upside down so turning the picture over 180 degrees makes it easier to see.

## Identical Cars

RK| Founder | Profile October 19th, 2013 - 1:21 pm saysThe official answer I had relates to what Obiwan says in 4a: more friction related wear in the car traveling against the direction of earth rotation (more downward force).

Joe, Andy,and Obiwan however, raise other variables that could play potentially a more important role!

## Where is the Astronomer?

Hidden Object, Where is the Officer? | Smart-Kit Puzzles and Games| Guest October 19th, 2013 - 1:05 pm says[…] Like this? Check out this card, ‘Where is the Astronomer?’ […]

## Identical Cars

Obiwan| Profile October 17th, 2013 - 11:22 pm saysSeems like too many potential variables unless there is a trick answer…

1. Is there significant to “and are on different roads”? I assume not, but it is a

curious statement.

2. Are we to assume the “new earth” is a perfect sphere?

3. Weather variations are gone because oceans are gone?

4. Variables to think about:

a) Miniscule differences in downward forces related to travel with versus against

direction of earth rotation?

b) Relationship to sun–tilted axis of rotation leading to more or less sun exposure, change in tire pressure related to more sunlight–>less wear in the car that has higher average tire pressures?

c) Greater reduction in gravitation pull related to moon’s influence?

This is probably an easy question for a geophysicist…

## Identical Cars

andy75043| Profile October 17th, 2013 - 2:57 pm saysIn re: my previous comment, I made a mistake. At the equator, where our (fictional) cars are, the prevailing winds are the trade winds out of the east, which would help the westbound car and make the eastbound one wear out its tires faster.

Still, my previous comment stands. We don’t know what the prevailing winds would be on a smooth ocean-free world, and so we don’t know enough to answer the question.

## Identical Cars

andy75043| Profile October 17th, 2013 - 2:40 pm saysThere’s not really enough information for a good answer. Currently existing production cars will spend as much time in daylight as dark, so sunlight will average out and not be a factor. On the other hand, if we postulate 1000 mph cars, this isn’t true, and the answer depends on whether or not the westbound car is always in sunlight; if so, the warmer roads will wear out the rubber tires faster.

The other factor that might might make a difference is prevailing winds which, in the real world, are mostly west to east and would make the westbound car work harder (and therefore wear out its tires faster). But would that still be true on a smooth ocean-free Earth? I doubt that we know.

## Identical Cars

joe| Profile October 11th, 2013 - 9:26 am saysIf we assume the cars will travel along the equator and that the drivers have enough water to live on, on this new harsh Earth, then the only thing I can think of is the fact that the car travelling West will spend more time in daylight, and therefore more sun and more heat. And this causes more tire wear.

Why does it spend more time in daylight? Well say the Earth rotates at about 1000mph along the equator, if the car also travelled West at that speed it would be constantly in the sun. It probably won´t travel that fast but any fraction of it will still mean it spends more time in the hotter tire wearing part of the day. The other car will spend relatively more time in the cooler nights.