A train 1000 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 the correct choice from the following options:
A) 288 m B) 256 m C) 1000 m D) 278 m E) 287 m
Speed = 78 * 5/18 = 65/3 m/sec.   Time = 1 min = 60 sec.   Let the length of the train be x meters.   Then, (1000 + x)/60   = 65/3   x = 300 m.   Answer:1000 m
<result>C</result>
A train 1000 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?