d = 150 + 850 = 1000m. = 1 km.
d = V*t
1 = 45*t
t = 0.0222h,
t = 0.0222h * 3600s/h = 80 s.
A 150m long train is moving with uniform velocity of 45km/hr.The time taken by the train to cross a bridge of length 850 meters is
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