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A and B runs around a circular track. A beats B by one round or 10 minutes. In this race, they had completed 4 rounds. If the race was only of one round, find the A's time over the course:

Correct Answer: 7.5 min

Explanation:

B runs around the track in 10 min.


 i.e ,    Speed of B = 10 min per round


 Therefore,  A beats B by 1 round


  Time taken  by A to complete 4 rounds 


  = Time taken by B to complete 3 rounds  


 = 30 min 


 


Therefore, A's speed = 30/4 min per round = 7.5 min per round


 Hence, if the race is only of one round A's time over the course = 7 min 30 sec


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