A man walking at 5 km h noticed that a 225 m long train coming in the opposite direction crossed him...........

Quantitative Aptitude (CDS) Time & distance

A man walking at 5 km/h noticed that a 225 m long train coming in the opposite direction crossed him in 9 s. The speed of the train is

75 km/h

80 km/h

85 km/h

90 km/h

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Explanation:

Let the speed of the train = x km/h
Then, relative speed of train = (x + 5) km/h
and length of the train = 225 m = 0.225 km [given]
Time taken by train to cross the man =0.225/x+5 hours
According to the question
0.225 /(x +5) = 9 / 3600
=> x + 5 = 90 => x = 85 km/h
Hence, the speed of the train is 85 km/h.