Robert’s rally car

Robert’s rally car goes uphill at an average speed of 40 miles per hour.

It goes downhill and on the level at an average speed of 60 miles per hour.

After 10 hours it has covered 540 miles.

For how long was it going uphill?

Age 9-11

Brainteaser solutions

Robert’s rally car

The car went uphill for 3 hours. Let the number of hours uphill be h. Then the number of hours downhill and on the level is 10 - h. The number of miles covered is: 40h + 60(10 - h) = 540So h = 3.

Coin magic

You need four of each of these coins: Arrange the 16 coins in a 4X4 square.

The total of each row, each column and each diagonal should be 37p.