The length of the bridge, which a train 140 meters long and travelling at 45 km/hr can cross in 30 seconds, is:  Pick.
A) 230
B) 244
C) 245
D) 238
E) 235
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; 2(140 + X) = 750 ==&gt; X = 235 m.   Answer: Option 235
<result>E</result>
The length of the bridge, which a train 140 meters long and travelling at 45 km/hr can cross in 30 seconds, is: