Question

Abhishek, Bobby and Charlie start from the same point and travel in the same direction round an Island 6 km in circumference. Abhishek travels at the rate of 3, Bobby at the rate of 2(1/2)` ` and Charlie at the rate of 1(1/4) km/hour. In how many hours will they come together again?

A 6 hrs
B 12 hrs
C 24 hrs
D 15 hrs
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