A man is standing on a railway bridge, which is 70 m long. He finds that a train crosses the bridge in 5 and a half second, but crosses him in 2 seconds. Find the length of the train and its speed.
1
40m, 72km/hr
2
45m, 73 km/hr
3
49m, 70 km/hr
4
39m, 75 km/hr