If in a race of 100m, A covers the distance in 20 seconds and B in 25 seconds, then A beats B by:
Select
A) 20 m B) 16 m C) 11 m D) 10 m E) 15 m

Rationale: "explanation : the difference in the timing of a and b is 5 seconds . hence , a beats b by 5 seconds . the distance covered by b in 5 seconds = ( 100 * 5 ) / 25 = 20 m hence , a beats b by 20 m . answer a"
Answer: A