A jogger running at 9 kmph alongside a railway track in 240 metres ahead of the engine of a 120 metres long train running at 45 kmph in the same direction. In how much time will the train pass the jogger?

A. 3.6 sec B. 18 sec
C. 36 sec D. 72 sec

• distance=120+240=360meter
  in same direction so,
  relative speed= 45-9=36km/h = 36*5/18=10m/sec
  time=360/10=36sec.
  
• 12 years agoHelpfull: Yes(2) No(1)
• train have to cross the jogger only not the railway track then here in the solution why u add the length of track also
• 11 years agoHelpfull: Yes(0) No(0)