Three boys runs around a circular track and takes 20 min, 25 min and 30 min respectively to complete the one round. When do they all come relatively to the same position as at a certain point of time in their path?

∴ Required time = LCM of (20, 25 and30) = 300 min Hence, after 300 min they all come relatively to the same position as at a certain point of time in their path.

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