Time taken to cross a moving person = length of train/ relative speed
Time taken = 390/((45-9) (5/18) = 390/ 36*(5/18) = 390/10 = 39 sec
A train which has 390 m long, is running 45 kmph. In what time will it cross a person moving at 9 kmph in same direction ?

(a) 26 sec
(b) 39 sec
(c) 36 sec
(d) 29 sec
(e) 30 sec