| How long (time in seconds) will a 450 m long train take to cross a girl walking with a speed of 5 km/h in the direction of the moving train. The speed of the train is 65 km/h? [NICL (AO) 2013] |
A) 27
B) 28
C) 30
D) 29
E) None of these
Correct Answer: A
Solution :
| Relative speed \[=(65-5)=60\,km/h\] |
| Distance = 450 m |
| \[\therefore \] Time taken by train to cross the girl |
| \[=\,\,\frac{450}{\frac{60\times 1000}{3600}}=\frac{450\times 3600}{60\times 1000}=27\,s\] |
You need to login to perform this action.
You will be redirected in
3 sec
