There is a circular path around a sport field. Sonia takes 18min to drive one around of the field, while Ravi takes 12min for the same. Suppose they both start at the same point at the same time, and go in the same direction, after how minutes will they meet again at the starting point?
36
LCM of 18 and 12 is :
Required time = LCM of 18 and 12 = 2 x 2 x 3 x 3
= 36 minutes.