Question

Swapnil, Aakash and Vinay begin to jog around a circular stadium. They complete one lap in 36 seconds, 48 seconds and 42 seconds respectively. After how many seconds will they be together at the starting point?
(a) 504 seconds (b) 940 seconds
(c) 1008 seconds (d) 470 seconds
(e) None of these

Answer 1

(c) They will be together at the starting point after the L.C.M of 36, 48 and 42 L.C.M. of 36, 48, 42 = 1008 seconds