Detailed Solution Download Solution PDF Given: A beats B by 40 seconds B beats C by 10 seconds A beats C by 150 meters Calculation: Let time taken by A to complete the race be t Let time taken by B to complete the race be t + 40 Let time taken by C to complete the race be t + 40 + 10 = t + 50

In a km race A beats B by 28metres or 7 sec. It means B covers 28 mtr in 7 secs or 4 mtr /sec. B covers 1 km or 1000 mtr in 1000/4 = 250 secs. A covers 1 km in 250-7 = 243 secs. A's speed per sec = 1000/243 mtrs /sec = 4.115 mtr/sec