A train of length 342 m is running at 54 km/h. In how much time(in seconds) will it cross a bridge of length 438 m?
As per the question,
Length of the train=342m
The velocity of the train $$(v)=54km/hour=\dfrac{54\times 1000}{3600}=15m/sec$$
Length of the bridge $$l=438m$$
Total time will take to cross length $$=342+438=780$$
Hence, time (t) $$=\dfrac{780}{15}=52m/sec$$
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