A train 360 m long is running at a speed of 45 km hr In what time will it pass a bridge 140 m long ........

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A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

20 s

30 s

40 s

50 s

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Explanation:

We have already seen the formula for converting from km/hr to m/s: x km/hr =[ x × ( 5/18) ]m/s.
Therefore, Speed =[45 x (5/18) m/sec = (25/2)m/sec.
Thus the total distance to be covered = (360 + 140) m = 500 m. Also, we know that the formula for finding Time = ( Distance/Speed )
Hence, the required time = [ (500 x 2)/25 ] sec = 40 sec.