The length of the bridge, which a train 130 meters long and travelling at 45 km/hr. can cross in 30 seconds, is:
200 m
225 m
245 m
250 m
Explanation:
Speed = (45 x 5/18) m/sec = 25 m/sec.
Time = 30 sec.
Let the length of bridge be x meters.
Then, (130 + x)/30 = 25/2.
=> 2(130 + x) = 750
=> x = 245 m.