A train moving with uniform speed crosses a man standing at platform in 2 seconds and a bridge of length 250 m in 7 seconds.The length of train is :
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A train moving with uniform speed crosses a man standing at platform in 2 seconds and a bridge of length 250 m in 7 seconds.The length of train is :
A. 75 m
B. 85 m
C. 100 m
D. 107 mAnswer: Option C
Explanation:
Let the length of train = x m
Speed of train = x/2 = ( x +250)/7
7x = 2 (x + 250)
7x = 2 x + 500
5x = 500
x = 100 m
Hence, length of train =x m = 100 m
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