Posted by Tom on Tuesday, June 11, 2013 at 5:46am.
Alvin, Calvin and Melvin are running laps around a track. Alvin runs a lap every 4 minutes, Calvin runs a lap every 6 minutes and Melvin runs a lap every 9 minutes. If they start off at the same point, how many minutes will it take before all three of them are back at the starting point?

Math  anonymous, Tuesday, June 11, 2013 at 7:23am
36

Math  Anonymous, Tuesday, September 27, 2016 at 2:46am
4x6x9= 216 mins
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