The length of the bridge, which a train 170 meters long and travelling at 45 km/hr can cross in 30 seconds, is?  Choose the correct choice from the following answers:
A) 766 m
B) 205 m
C) 245 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, (170 + X)/30 = 25/2   ==&gt; 2(170 + X) = 750 ==&gt; X   = 205 m.   Answer: 205 m
<result>B</result>
The length of the bridge, which a train 170 meters long and travelling at 45 km/hr can cross in 30 seconds, is?