There is a circular path around a sports field. Sonia takes 18 minutes to drive one round of the field, while Ravi takes 12 minutes for the same. Suppose they both start at the same point and at the same time, and go in the same direction. After how many minutes will they meet again at the starting point?

Solution:

According to the given statement, both Sonia and Ravi move in the same direction, and at the same time.

Here, the method to find the time when they will be meeting again at the starting point is LCM of 18 and 12.

Therefore, LCM(18, 12) = 2 × 3 × 3 × 2 = 36

Hence, Sonia and Ravi will meet again at the starting point after 36 minutes.