The length of the bridge, which a train 170 metres long and travelling at 45 km/hr can cross in 30 seconds, is? Pick one: A) 245 B) 777 C) 282 D) 266 E) 205
Speed = [45 X 5/18] m/sec = [25/2] m/sec Time = 30 sec Let the length of bridge be x metres. Then, (170 + x)/30 = 25/2 =&gt; 2(170 + x) = 750 =&gt; x = 205 m.   Answer: 205
<result>E</result>
The length of the bridge, which a train 170 metres long and travelling at 45 km/hr can cross in 30 seconds, is?