The length of the bridge, which a train 120 metres long and travelling at 45 km/hr can cross in 30 seconds, is?
Choose the correct choice from the following:
A) 10 m
B) 255 m
C) 245 m
D) 19 m
E) 27 m
Speed = [45 X 5/18] m/sec = [25/2] m/sec Time = 30 sec Let the length of bridge be x metres. Then, (120 + x)/30   = 25/2 =&gt; 2(120 + x) = 750 =&gt; x   = 255 m.   Answer: 255 m
<result>B</result>
The length of the bridge, which a train 120 metres long and travelling at 45 km/hr can cross in 30 seconds, is?