In 110 m race, A covers the distance in 36 seconds and B in 45 seconds. In this race A beats B by:  Choose one: A) 20 m B) 25 m C) 22 m D) 9 m E) 12 m

Rationale: "distance covered by b in 9 sec . = 110 / 45 x 9 m = 22 m . a beats b by 20 metres . answer : option c"
Answer: C