Two trains of equal length are running on parallel lines in the same direction at speeds of 101 km/h and 65 km/h. The fastertrain passes the slower train in 30 seconds. The length of each train is:

Correct option is B

Given:
Speed of the faster train = 101 km/h
Speed of the slower train = 65 km/h
Time taken by the faster train to pass the slower train = 30 seconds
Length of each train is the same, and we need to find the length of each train. 

Formula Used: ​

Distance = Speed $$\times$$ Time​

Solution: ​

Relative Speed = 101 - 65 = 36 km/h 

in m/sec = $$36 \times \frac{5}{18} = 10 \ m /sec$$

Now , 

Distance = $$30\times 10 = 300 \ m$$​​

So, length of the one train = $$\frac{300}{2} = 150 \ m$$