In a 100-m race, A beats B by 20 m and B beats C by 5 m. In the same race, A beats C by:

24 m

According to the question,

When A covers 100 m, B covers 80 m

And when B covers 100 m, C covers 95 m

So, the distance ratio of A to B and B to C are 10 : 8 and 20 : 19

A : B : C = 200 : 160   : 152

= 100 : 80 : 76

So, A beats C by 100 - 76

= 24 m

∴ A beats C by 24 m