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Problems on Trains
Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. Fast train completely passes a man sitting in the slower train in 5 seconds. What is the length of the fast train?
23 m
23 2⁄9 m
27 7⁄9 m
29 m
Correct Answer:
27 7⁄9 m
Explanation:
Relative speed = (40 - 20) km/hr =
❨
20 x
5
❩
m/sec =
❨
50
❩
m/sec.
18
9
∴ Length of faster train =
❨
50
x 5
❩
m =
250
m = 27
7
m.
9
9
9
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