Question
A and B walk around a circular track. They start at 8 a.m. from the same point in the opposite directions. A and B walk at a speed of 2 rounds per hour and 3 rounds per hour respectively. How many times shall they cross each other before 9.30 a.m. ?
Answer: Option C
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Relative speed = 2 + 3 = 5 rounds per hour.So, they cross each other 5 times in an hour and 2 times in half an hour.Hence, they cross each other 7 times before 9.30 a.m.
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