A 120 meter long train is running at a speed of 90 km/hr. It will cross a railway platform 230 m long in :

Answer: Option D

Speed = $$\left(90\times \frac{5}{18}\right)$$   m/sec = 25 m/sec
Total distance covered
= (120 + 230) m
= 350 m
∴ Required time
= $$\frac{350}{25}$$ seconds
= 14 seconds