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

✅ The correct answer is option C.
Speed of train relative to jogger = (45 – 9) km/hr = 36 km/hr.

36 x
5
m/sec

= 10 m/sec.
Distance to be covered = (240 + 120) m = 360 m.

Time taken =

360
sec
= 36 sec.

70. 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?