A train overtakes two persons who are walking in the same direction in which the train is going, at the rate of 2 kmph and 4 kmph and passes them completely in 9 and 10 seconds respectively. The length of the train is :
a) 72 metres
b) 54 metres
c) 55 metres
d) 45 metres
e) 50 meters
a) 72 metres
b) 54 metres
c) 55 metres
d) 45 metres
e) 50 meters