The length of the bridge, which a train 130 m long and traveling at 45 km/hr can cross in 30 sec is?
Answer: C
Speed = 45 * 5/18 = 25/2 m/sec.
Time = 30 sec
Let the length of bridge be x meters.
Then, (130 + x)/30 = 25/2
x = 245 m.