Sakthi running at 27 kmph alongside a railway track in 272 metres ahead of the engine of a 240 metres long train running at 135 kmph in the same direction. In how much time will the train pass sakthi? A) 24 B) 29 C) 36 D) 17
ANSWER:D
Explanation:
Speed of the train = 135 kmph
Speed of sakthi = 27 kmph
Speed of train relative to sakthi = (135-27) kmph
=108 kmph
We have to find the time in seconds, so convert the speed in the unit of m/sec.
108 kmph = (108 * 5/18) m/s
= 30 m/s
Length of the train = 240 m
Distance covered by sakthi = 272m
Total Distance to be covered = (240 +2 72) m
= 512 m
Speed of the train = Distance / Time
Therefore Time taken = ( 512 / 30) sec
= 17 sec