A train 710 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?	Choose one
A) 2898 B) 277 C) 500 D) 297 E) 590
Speed = 78 * 5/18 = 65/3 m/sec.   Time = 1 min = 60 sec.   Let the length of the train be x meters.   Then, (710 + x)/60 = 65/3   x = 590 m.   Answer: 590
<result>E</result>
A train 710 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?