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.

**Click here to see the full blog post**

**last edited by**

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 ?

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.

**Click here to see the full blog post**