A 800 train meters long is traveling at a speed of 78 km/hr. if it crosses a tunnel in 1 minute than what is the length of the tunnel
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ANSWER :-
=>Let the tunnel be x meters long.
=> The speed of train=78km/h=78×5/18= 65/3 m/s(convert to m/s).
=>Time taken is 1 min=60 sec
=>Distance covered by the train = x+800.
=>The train covers the distance equal to the sum of its length and tunnel's length.
We know that,
=>Speed=Distance/Time
=>65/3 = x+800/60
=>x+800=65×20
=>x=1300–800
x=500 km.
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