The length of the bridge, which a train 160 meters long and travelling at 45 km/hr can cross in 30 seconds, is?  Choose the correct answer:
A) 766 m B) 156 m C) 215 m D) 156 m E) 156 m
Speed = (45 * 5/18) m/sec = (25/2) m/sec. Time   = 30 sec. Let the length of bridge be x meters. Then, (160 + X)/30 = 25/2   ==&gt; 2(160 + X) = 750 ==&gt; X   = 215 m.   Answer: 215 m
<result>C</result>
The length of the bridge, which a train 160 meters long and travelling at 45 km/hr can cross in 30 seconds, is?