52.
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A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:
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A.
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50 m
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B.
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150 m
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C.
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200 m
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D.
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Data inadequate
|
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Answer: Option B
Explanation:
Let the length of the train be x metres and its speed by y m/sec.
Then,
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x
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= 15 ==> y =
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x
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.
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y
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15
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15(x + 100) = 25x
15x + 1500 = 25x
1500 = 10x
x = 150 m.
