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A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds but himself in 8 seconds. Find the length of the train and its speed.
- A27 kmph
- B54 kmph
- C108 kmph
- D216 kmph
Correct answer: B
Discussion 1
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CCommunity
54 kmph
Let the length of the train be x metres.
Then, the train covers x metres in 8 seconds and (x + 180) metres in 20 seconds.
:. X/8 = (x + 180)/20 20x=8(x +180) x=120
:. Length of train = 120 m.
Speed of train = (120/8) m/sec = 15 m/sec = [15 X 18/5 ] Kmph = 54 Kmph.
Let the length of the train be x metres.
Then, the train covers x metres in 8 seconds and (x + 180) metres in 20 seconds.
:. X/8 = (x + 180)/20 20x=8(x +180) x=120
:. Length of train = 120 m.
Speed of train = (120/8) m/sec = 15 m/sec = [15 X 18/5 ] Kmph = 54 Kmph.