A 140m meters long train takes 12 seconds to cross Virat walking at 4 kmph in a direction opposite t

M4maths Previous Puzzles

08 Oct 2021 Train

A 140m meters long train takes 12 seconds to cross Virat walking at 4 kmph in a direction opposite to that of the train. Find the speed of train.

OPtion

1) 49 kmph
2) 52 kmph
3) 55 kmph
4) 56 kmph
5) 62 kmph
6) 51 kmph
7) 57 kmph
8) 38 kmph
9) 53 kmph
10) None of the above

Solution

Speed of train relative to man = ( X + 4) Kmph = (X + 4) x 5/18 m/seconds.
140/ (X + 4) x (5/18) = 12
(140 x 18)/ (X + 4) 5 = 12
60X + 240 = 2520
X = 2280/60 = 38 Kmph

Correct Option: 8 Best Solution (2)