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

A. 4 seconds

B. 7 seconds

C. 12 seconds

D. 14 seconds

Answer: Option D

Solution(By Examveda Team)

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