40.
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Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then the speed of the faster train is:
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A.
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30 km/hr
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B.
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45 km/hr
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C.
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60 km/hr
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D.
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75 km/hr
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Answer: Option C
Explanation:
Let the speed of the slower train be x m/sec.
Then, speed of the faster train = 2x m/sec.
Relative speed = (x + 2x) m/sec = 3x m/sec.
24x = 200
So, speed of the faster train =
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50
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m/sec
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3
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= 60 km/hr.
