A train 140m long is running at a speed of 45 km/hr. How long will it take to cross a bridge 360m long?

(C) 40 sec

Explanation

V = 45km/h is 3/4km or 750m per minute. Total distance is 140 + 360 = 500m. Time = d/V = 500/750 = 2/3 of a minute OR 40 sec. 

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