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Question

A and B are moving in a circular track in the same direction. They start simultaneously in a race which requires them to cover 15 rounds. Whenever A & B meet, it was found that the ratio of the number of rounds covered by them till then is 3:1. The time taken by B to complete the race if they meet every 5 minutes is?

A
75 mins
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B
100 min
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C
150 min
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D
50 min
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E
none of these
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Solution

The correct option is C 150 min

Ratio of speeds of A and B= 3:1, this means that when A makes 1.5 rounds, B makes ½ a round. For B to complete the race of 15 rounds, it would take him 15/0.5 x 5 =150 minutes


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