Homework Help: maths

Posted by fathima on Sunday, November 25, 2012 at 3:31am.

the ghaziabad train passes every 20 minutes the faridabad train passses every 15 minutes the gurugaon train passes every 18 minutes it is 6 p m and all the train just passed by when is the next time that will happen

maths - Steve, Sunday, November 25, 2012 at 2:44pm
LCM(20,15,18) = 2^2 * 3^2 * 5 = 180

so, the time will be 9:00 pm when it happens again.

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