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A 210 m long train takes 6 s to cross a man running at 9km/h in a direction opposite to that of the train . What is the speed of the train ? (in km/h)

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A 210 m long train takes 6 s to cross a man running at 9km/h in a direction opposite to that of the train . What is the speed of the train ? (in km/h)
A. 127
B. 121
C. 117
D. 108
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Correct Answer - C
V be the speed of train
`V + 9 = (210)/(6 xx 1000) xx 3600`
V + 9 = 126
V = 117 km/h
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