Amy's home is 1.8 km from the shop. One evening she went to the shop and was in there for 10 minutes.
Calculate the average speed in km/h on her way to the shop.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.