A and B walk around a circular park. They start at 8 a.m. from the same point in the opposite directions.

Monjur Alahi

A and B walk around a circular park. 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 after 8·00 a.m. and before 9.30. a.m.?
(a) 7 

(b) 6
(c) 5 

(d) 8


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Salim Ahmed Kawsar

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(a) Here, A and B are moving in opposite directions. So, Relative speed = 2 + 3 = 5 rounds/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 before9 :30 a.m.

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