18.
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A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?
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A.
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120 m
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B.
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240 m
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C.
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300 m
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D.
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None of these
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Answer: Option B
Explanation:
Speed =
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54 x
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5
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m/sec = 15 m/sec.
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18
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Length of the train = (15 x 20)m = 300 m.
Let the length of the platform be x metres.
x + 300 = 540
x = 240 m.
