The length of the bridge, which a train 170 meters long and travelling at 45 km/hr can cross in 30 seconds, is:	Choose one.
A) 239
B) 277
C) 205
D) 88
E) 232
Speed = (45 * 5/18) m/sec = (25/2) m/sec. Time = 30 sec. Let the length of bridge be x meters. Then, (170 + X)/30   = 25/2 ==&gt; 2(170 + X) = 750 ==&gt; X = 205 m.   Answer: 205
<result>C</result>
The length of the bridge, which a train 170 meters long and travelling at 45 km/hr can cross in 30 seconds, is: