The length of the bridge, which a train 140 meters long and travelling at 45 km/hr can cross in 30 seconds, is? Choose the most appropriate option:
A) 766 m	B) 156 m	C) 245 m	D) 156 m	E) 235 m
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: 235 m
<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?