Tony takes 3 minutes to run a lap in the playground, Mike need 4 minutes to run a lap, and Susan need 5 minutes to run a lap. Now the three people stand at the front of the line and start running at same time. How long will the people meet again?

The result is expressed in minutes.

The answer is 60.

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The least common multiple of 3, 4 and 5 is 60.