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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 21⁄2 Km/h, 3 Km/h and 2 Km/h. respectively. Then on the starting point all three will meet again after :
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- 30 hours
- 6 hours
- 10 hours
- 15 hours
Correct Option: C
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.
