The length of the bridge, which a train 140 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
Pick one.
A) 235
B) 240
C) 245
D) 250
E) 260
Speed = [45 X 5/18] m/sec = [25/2] m/sec Time = 30 sec Let the length of bridge be x metres. Then, (140 + x)/30 = 25/2 =&gt; 2(140 + x) = 750 =&gt; x = 235 m.   235nswer: Option 235
<result>A</result>
The length of the bridge, which a train 140 metres long and travelling at 45 km/hr can cross in 30 seconds, is: