The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
Choose the correct choice from the following answers:
A) 200 meters
B) 225 meters
C) 245 meters
D) 250 meters
E) 300 meters
Given, Length of the train = 130 meters   Speed of the train = 45 km/hr = 45 * 518 m/sec = 252 m/sec   Time = 30 secs   Let the length of the bridge be x meters .   The distance travelled by the train while crossing the bridge will be sum of the length of train and Length of the bridge = (x+130) meters   so , 252 = x+13030   = 30*25 = 2x + 260   = 750 - 260 = 2x   = 490 = 2x   =x = 245 meters. ANSWER 245 meters
<result>C</result>
The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is: