If in a race of 80m, A covers the distance in 20 seconds and B in 25 seconds, then A beats B by:  Choose one
A) 16 m B) 18 m C) 15 m D) 14 m E) 11 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 = ( 80 * 5 ) / 25 = 16 m hence , a beats b by 16 m . answer : a"
Answer: A