In 140 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:  Choose the correct choice from the following options
A) 20 m B) 28 m C) 22.5 m D) 9 m E) 12 m

Rationale: "distance covered by b in 9 sec . = 140 / 45 x 9 m = 28 m . a beats b by 28 metres . answer : option b"
Answer: B