Question

Ravi & shikha drive around a circular sports field. Ravi takes 16 min to complete one round, while Shikha completes the round in 20 min if both start at the same point, at the same time and go in the same direction , then after how much time will they me at the starting point.

Answer 1

after 4 min they will at starting point

Answer 2

For knowing when will they meet again we should take LCM of 16 and 20 . LCM of 16 and 20 is 80 .Hence they will meet after 80 minutes.