Subject: General Aptitude · Chapter: Problems on Trains · Exam: · Marks: · Difficulty:
A jogger running at 9 kmph alongside a railway track is 240 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?
(a)3.6 sec
(b)18 sec
(c)36 sec
(d)72 sec
Answer
Answer (as printed): C
Explanation
Speed of train relative to jogger $=(45-9) \mathrm{km} / \mathrm{hr}=36$ $$\mathrm{km} / \mathrm{hr}=\left(36 \times \frac{5}{18}\right) \mathrm{m} / \mathrm{sec}=10 \mathrm{m} / \mathrm{sec} .$$ Distance to be covered $=(240+120) \mathrm{m}=360 \mathrm{m}$. $$\text { ∴ Time taken }=\left(\frac{360}{10}\right) \mathrm{sec}=36 \mathrm{sec} .$$