Question: How many seconds will a 500 m long train take to cross a man walking with a speed of 3 km/h in the direction of the moving train, if the speed of the train is 63 km/h?
Options:
A) 25
B) 30
C) 40
D) 45
Show Answer
Answer:
Correct Answer: B
Solution:
- Relative speed of train $ =,63-3=60,km/h $
$ =60\times \frac{5}{18}m/s $
$ \therefore $ $ Time=\frac{Length,of,train}{Relative,speed}=\frac{500\times 18}{60\times 5}=30,s $