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From a point on a circular tract 5 Km long A, B and C started running in the same direction at the same time with speeds of 2 1⁄ 2 Km/h, 3 Km/h and 2 Km/h. respectively. Then on the starting point all three will meet again after :

Correct Answer: 10 hours

Explanation:

A will reach at starting point in 5 * 2 / 5 = 2 hours ;
B will reach at starting point in 5 / 3 hours ;
C will reach at starting point in 5 / 2 hours ;
Then, on the starting point all three will meet after the L.C.M. of 2, 5 / 3, 5 / 2, 10 / 1 = 10 hours.


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