A train 990 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?
Options
A) 2898
B) 277
C) 310
D) 297
E) 435
Speed = 78 * 5/18 = 65/3 m/sec.   Time = 1 min = 60 sec.   Let the length of the train be x meters.   Then, (990 + x)/60 = 65/3   x = 310 m.   Answer: 310
<result>C</result>
A train 990 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?