In 120 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:  Choose the correct answer.
A) 24 m
B) 25 m
C) 22.5 m
D) 9 m
E) 12 m

Rationale: "distance covered by b in 9 sec . = 120 / 45 x 9 m = 24 m . a beats b by 24 metres . answer : option a"
Answer: A