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Q: A train 900 m long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 min, then the length of the tunnel is ?

  • 1
    400 m
  • 2
    300 m
  • 3
    500 m
  • 4
    600 m
  • Show Answer
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Answer : 1. "400 m"
Explanation :

Answer: A) 400 m Explanation: Speed = 78 x 5/18 = 65/3 m/sec.Time = 1 min = 60 sec.Let the length of the train be x meters.Then, (900 + x)/60 = 65/3x = 400 m.

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