The length of the bridge, which a train 100 metres long and travelling at 45 km/hr can cross in 30 seconds, is:	Choose the correct choice from the following.
A) 230 B) 240 C) 245 D) 250 E) 275
Speed = [45 X 5/18] m/sec = [25/2] m/sec Time = 30 sec Let the length of bridge be x metres. Then, (100 + x)/30 = 25/2 =&gt; 2(100 + x) = 750 =&gt; x = 275 m.   Answer: Option 275
<result>E</result>
The length of the bridge, which a train 100 metres long and travelling at 45 km/hr can cross in 30 seconds, is: