In a 1 km race, A beats B by 40 m and C by 64 m. By how many metres does B beat C in a 1 km race?

Explanation

1. 01

   While A runs 1,000 m, B runs 960 m and C runs 936 m.

2. 02

   While B runs 1,000 m, C runs $\frac{936}{960} \times 1{,}000 = 975$ m, so B wins by 25 m.