A 120 metres long train is running at a speed of 90 km per hour. It will cross a railway platform 230 m long in ?
A. $$4\frac{4}{5}$$ sec
B. $$9\frac{1}{5}$$ sec
C. 7 sec
D. 14 sec
Answer: Option D
Solution(By Examveda Team)
Here, speed of the running train is 90 km/hrAnd length of the train is = 120 metres
We know that,
When a train crosses through the platform, it cover the distance equal to the length of platform + length of the train
So, the time will taken by the train :
$$\frac{{{\text{Length of train}} + {\text{Length of platform}}}}{{{\text{Speed}}}}$$
$$\eqalign{ & = \frac{{\left( {120 + 230} \right){\text{ metres}}}}{{90{\text{ km/hr}}}} \cr & = \frac{{350 \times 18}}{{90 \times 5}} \cr & = 14\sec \cr} $$
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