Problems on trains

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A train leaves Mumbai at 9 am at a speed of 40 kmph. After one hour, another train leaves Mumbai in the same direction at a speed of 50 kmph. When and at what distance from Mumbai will the two trains meet?

1:00 pm, 220 km

1:00 pm, 200 km

2:00, 200 km

2:00 pm, 220 km

Explanation:

When the second trains leaves Mumbai the first train covers 40 × 1 = 40 km
So, the distance between first train and second train is 40 km at 10:00 am
Time taken by the trains to meet
= Distance /Relative speed
= 40 /50 - 40 = 4 hours
So, the two trains will meet 4 × 50 = 200 km away from Mumbai at 2 p.m.

By: Amit Kumar

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