The Meeting Problem in Primary Mathematics

A It took 18 minutes to walk around.

B It takes 360 seconds to run a lap, which means it takes 6 minutes to run a lap.

C It took four minutes to ride a bike twice, that is, it took two minutes to ride a bike once.

So the time when they meet again is the least common multiple of 18,6,2, which is18 minutes. (Provided that we both start from the same place and the same direction)

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