A train 300 m long is running at a speed of 25 metres per second it will cross a bridge 200 metres l...........

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A train 300 m long is running at a speed of 25 metres per second, it will cross a bridge 200 metres long in

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Explanation:

To solve this question, we can apply a short trick appraoch;
"When a train passes a platform or crosses a bridge it should travel the length equal to the sum of the length of train and platform or bridge both"
Reqd. time = Length of Train + Length of Bridge /Speed of Train
Given
Speed of train = 25 m/sec
Length of train = 300 m, Length of bridge = 200 m
Crossing time of bridge = x
By the short trick approach, we get
x = 300 + 200 /25 = 20 sec.