A train, 800 meters long is running with a speed of 78 km/hr. It crosses a tunnel in 1 minute. What is the length of the tunnel?
Answer with explanationAnswer: Option D
Let length of tunnel is x meter
Distance = 800+x meter
Time = 1 minute = 60 seconds
Speed = 78 km/hr = 78*5/18 m/s = 65/3 m/s
Distance = Speed*Time
So the length of the tunnel is 500 meters.
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