A train 400 m long overtook a man walking along the line in the same direction as the train, at the rate of 5 kmph and passed him in 40 seconds. The train reached the station in 20 minutes after passing the man. In what time did the man reach the station? `2\ h r\ 24\ m in` b. `2\ h r 30min40\ s e c` c. `2\ h r\ 36min48\ s e c` d. `2\ h r\ 48min48\ s e c`