Question
A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:
Answer: Option C
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Speed =\(\left(78\times\frac{5}{18}\right)m/sec = \left(\frac{65}{3}\right)m/sec.\)
Time = 1 minute = 60 seconds.
Let the length of the tunnel be x metres.
Then,\(\left(\frac{800+x}{60}\right) = \frac{65}{3}\)
3(800 + x) = 3900
x = 500.
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