The time taken by a train 180 m long, travelling at 42 kmph, in passing a person walking in the same direction at 6 kmph, will be

Answer: Option A

Speed of train relative to man
= (42 - 6) kmph = 36 kmph
= $$\left(36\times \frac{5}{18}\right)$$  m/sec
= 10 m/sec
∴ Time taken to pass the man
= $$\frac{180}{10}$$ sec
= 18 sec