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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They will meet again after LCM of both values at starting point.
18 = 2×3×3
And
12 = 2×2×3
LCM of 12 and 18 = 2×2×3×3 = 36
Therefore,
Ravi and Sonia will meet together at the starting point after 36 minutes.

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