The length of the train which is moving at 54km/hr, can crosses a bridge of length 245 m in 30 sec, is ?  Options
A) 260 m.  B) 345 m.  C) 130 m.  D) 245 m.  E) 145 m.
Speed = [45 X 5/18] m/sec = [25/2] m/sec Time = 30 sec Let the length of train be x metres. Then, (245 + x)/30   = 25/2 =&gt; 2(245 + x)=750   130 = x   = 130 m.   Answer:130 m.
<result>C</result>
The length of the train which is moving at 54km/hr, can crosses a bridge of length 245 m in 30 sec, is ?