SOLUTION: Two model trains begin at the toy train station and travel continuosly on two circular tracks of equal length. The first train completes a circuit in 20 seconds and the second trai

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Question 625655: Two model trains begin at the toy train station and travel continuosly on two circular tracks of equal length. The first train completes a circuit in 20 seconds and the second train in 15 seconds. if both trains leave the station at the same time, after how many seconds will the two trains meet again
Answer by reynard2007(52) About Me  (Show Source):
You can put this solution on YOUR website!

The first train goes back to the station after 20, 40, 60, 80,.. seconds
The second goes back to that station after 15, 30, 45, 60,... seconds
 
For problems like this, you just look for the LCM. Here it is 60. So, the trains will meet after 60 seconds.