A: B and C are three contestants in a km race. If A can give B a start of 40m and A can give C a start of 64m: how many metres start can B give C.

A, B and C are three contestants in 1 km race. If A can give B a start of 40 m and A can give C a start of 64 m, how many metres start can B give C?

A, B and C are three contestants in a 500 m race. If A can give B a start of 20 m and A can give C a start of 32 m, how many metres start can B give to C in the same race?

A, B and C are three participants in 1 km race. If A can give B a start of 40 m and B can give C a start of 25 m, how many metres A can give C a start?

P, Q and R are three contestants in a 2 km race. If P can give Q a start of 100 m and P can give R a start of 138 m ,then how many metres start can Q give to R?