A runner running at 9 kilometres per hour runs alongside a railway track 240 metres ahead of the engine of a 120-meter-long train travelling at 45 kilometres per hour in the same direction. How long will the train take to pass the jogger?
A. 3.6 sec
B. 18sec
C. 36sec
D. 72 sec
Answer:C
A runner running at 9 kilometres per hour runs alongside a railway track 240 metres ahead of the engine of a 120-meter-long train travelling at 45 kilometres per hour in the same direction. How long will the train take to pass the jogger?
A. 3.6 sec B. 18sec C. 36sec D. 72 sec
Explanation: The train's speed in relation to the runner is (45 - 9) km/hr, or 36 km/hr. 10 m/sec = 36 x 5/18 m/sec.(240 + 120) m = 360 m is the distance to be covered.1 minute = 360/10 seconds = 36 seconds