The length of the bridge, which a train 140 meters long and travelling at 45 km/hr can cross in 30 seconds, is?  Choose one.
A) 388  B) 267  C) 235  D) 288  E) 261
Speed = (45 * 5/18) m/sec = (25/2) m/sec. Time = 30 sec. Let the length of bridge be x meters. Then, (140 + X)/30 = 25/2 ==&gt; X = 235 m.   Answer: 235
<result>C</result>
The length of the bridge, which a train 140 meters long and travelling at 45 km/hr can cross in 30 seconds, is?