A passenger train leaves Calcutta at 4 PM and travels at the rate of 30 kilometres an hour. The mail train leaves Calcutta at 9 PM and travels, on a parallel line of rails, at the rate of 45 km an hour, when will the second train overtake the first?

12 hrs after the first train starts

10 hrs after the first train start

12 hrs after the second train starts

10 hrs after the second train starts

A passenger train leaves Calcutta at 4 PM and travels at the rate of 3

1.	A passenger train leaves Calcutta at 4 PM and travels at the rate of 30 kilometres an hour. The mail train leaves Calcutta at 9 PM and travels, on a parallel line of rails, at the rate of 45 km an hour, when will the second train overtake the first?
A.	10 hrs after the first train start
B.	12 hrs after the second train starts
C.	10 hrs after the second train starts
D.	12 hrs after the first train starts
E.	None of these
Answer» D. 12 hrs after the first train starts

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A passenger train leaves Calcutta at 4 PM and travels at the rate of 30 kilometres an hour. The mail train leaves Calcutta at 9 PM and travels, on a parallel line of rails, at the rate of 45 km an hour, when will the second train overtake the first?

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