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:

Option
A. 130
B. 360
C. 500
D. 540

Answer 1

Option C

Explanation:

Speed =78 x5m/sec=65m/sec.183

Time = 1 minute = 60 seconds.

Let the length of the tunnel be x metres.

Then,800 + x=65603

3(800 + x) = 3900

 x = 500.