The length of the bridge, which a train 140 metres long and travelling at 45 km/hr can cross in 30 seconds, is?
Choose the correct option:
A) 10 m
B) 16 m
C) 245 m
D) 19 m
E) 235 m
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.   Answer: 235 m
<result>E</result>
The length of the bridge, which a train 140 metres long and travelling at 45 km/hr can cross in 30 seconds, is?