In a 100 m race,A covers the distance in 36 seconds and B in 45 second.In this race A beats B by :	Answers
A) 20 m B) 25 m C) 22.5 m D) 9 m E) none of these

Rationale: "solution distance covered by b in 9 sec . = ( 100 / 45 x 9 ) m = 20 m . ∴ a beats b by 20 metres . answer a"
Answer: A