In a 100m race, A covers the distance in 36 seconds and B in 45 seconds. By how many meters does A beat B?
Q1. In a 100m race, A covers the distance in 36 seconds and B in 45 seconds. By how many meters does A beat B?
Answer: 20 m
Explanation: A's speed = 100/36 m/s; in 36 seconds B covers (100/45) × 36 = 80 m; A beats B by 100 − 80 = 20 m.