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
• B. 100 min
• C. 150 min
• D. 50 min
• E. none of these

Answer 1

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