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There is a circular path around a sports field. Soma 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?

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Time taken by Soma to drive one round of field in minutes, `a = 18`
Time taken by Ravi to drive one round of field in minutes, `b = 12`
In order to find the time when they meet again at the starting point, we have to find LCM of `a` and `b`.
`12 = 2^2**3 and 18 = 2^1**3^2` `LCM(18,12) = 2^2**3^2 = 36`
So, after `36` minutes they will meet again at the starting point.

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