A jogger running at 9 kmph along side a railway track is 270 metres ahead of the engine of a 120 metre long train running at 45 kmph in the same direction. In how much time will the train pass the jogger?
Options: A) 3.6 sec B) 18 sec C) 36 sec D) 39 sec E) none of these

Rationale: "speed of train relative to jogger = ( 45 – 9 ) km / h = 36 km / h = ( 36 × 5 ⁄ 18 ) m / sec = 10 m / sec distance to be covered = ( 270 + 120 ) m = 390 m . ∴ time taken = ( 390 ⁄ 10 ) sec = 39 sec . answer d"
Answer: D