Races and Games - General Questions

In a 100 m race, A beats B by 10 m and B beats C by 10 m. By how many metres does A beat C?

In a 400 m race, A beats B by 100 m and B beats C by 10 m. By how many metres does A beat C?

In a 400 m race, A beats B by 100 m and B beats C by 40 m. By how many metres does A beat C?

A can run 200 m in 16 seconds and B in 20 seconds. By how many metres does A beat B?

In a game of 100 points, A can give B 10 points and B can give C 15 points. How many points can A give C?