Question

Three sub-urban trains leave tambaram at 20 , 30 and 40 minutes intervals. If
they leave at 7:00 am together , when will be the next time they will leave the station
together ?

Answer 1

Answer:

9:00 a.m

Step-by-step explanation:

L.C.M of 20,30,40 is 120.

So,next time the trains will leave at the same time will be at 9:00 a.m