A man travels 480 km in 4 hours, partly by air and partly by train. If he had travelled all the way by air, he would have saved $$\frac{4}{5}$$ of the time he would have taken to travel by train and would have arrived at his destination 2 hours early. Find the distance he covered by travelling by train.

A

80 km

B

120 km

C

110 km

D

90 km