6.
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A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:
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A.
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45 km/hr
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B.
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50 km/hr
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C.
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54 km/hr
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D.
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55 km/hr
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Answer: Option B
Explanation:
Speed of the train relative to man =
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125
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m/sec
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10
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= 45 km/hr.
Let the speed of the train be x km/hr. Then, relative speed = (x - 5) km/hr.
x - 5 = 45 x = 50 km/hr.
