How many seconds will a 468 m long train take to cross a man driving his motor bike at a speed of 39

M4maths Previous Puzzles

11 Jun 2021 Train & Speed

How many seconds will a 468 m long train take to cross a man driving his motor bike at a speed of 39 km/hr in a direction of the moving train if the speed of the is 120 Km/hr.

OPtion

1) 28.0
2) 25.0
3) 21.5
4) 20.5
5) 22.5
6) 20.8
7) 19.8
8) 20.0
9) 23.8
10) None of the above

Solution

Speed of train relative to man on bike = 120 – 39 = 81 Km/hr
= (81 x 5/18) m/sec = 45/2 m/sec
Time taken to pass the man = 468/22.5 = 20.8 sec.

Correct Option: 6 Best Solution (3)