27.
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A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?
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A.
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40 sec
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B.
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42 sec
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C.
|
45 sec
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D.
|
48 sec
|
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Answer: Option A
Explanation:
Formula for converting from km/hr to m/s: X km/hr =
|
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X x
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5
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m/s.
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18
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Therefore, Speed =
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45 x
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5
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m/sec
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=
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25
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m/sec.
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18
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2
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Total distance to be covered = (360 + 140) m = 500 m.
Formula for finding Time =
|
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Distance
|
|
Speed
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Required time =
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500 x 2
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sec
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= 40 sec.
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25
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