A jogger running at 9 km h - 1 alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 km h - 1 in the same direction. In how much time will the train pass the jogger?

Question

A jogger running at 9 km h - 1 alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 km h - 1 in the same direction. In how much time will the train pass the jogger?, 3 . 6 s, 18 s, 36 s, 72 s

MARKS App · Accepted Answer

Speed of train relative to jogger = 45 – 9 km h - 1 = 36 km h - 1 = 36 × 5 18 m s - 1 = 10 m s - 1 Distance to be covered = ( 240 + 120 ) m = 360 m . ∴ Time taken = 360 10 s = 36 s .

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