Races and Games - General Questions

A can run 100 m in 14 seconds and B in 16 seconds. By how many metres does A beat B?

A runs 1 1/5 times as fast as B. If A gives B a start of x metres so that the race of 300 m ends in a dead heat, what is x?

A runs 1 1/4 times as fast as B. If A gives B a start of x metres so that the race of 100 m ends in a dead heat, what is x?

In a 100 m race, A beats B by 10 m and B beats C by 20 m. By how many metres does A beat C?

In a 1000 m race, A beats B by 25 m and B beats C by 100 m. By how many metres does A beat C?