Two trains of equal length are running on parallel lines in the same direction........What is the length of each train ?

Question

Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds.
What is the length of each train ?

Answer 1

Let length of each train =x metres
distance covered=2x metres
difference in speed=(46-36)km/hr
=10km/hr=25/9m/sec
time taken to overtake=36 sec
d/t=speed
2x/36=25/9
x=50
ans length of each train is 50 metres

Answer 2

Each train is 50 meters long.
In order for the faster train to pass the slower train, it has to travel a distance of 2 L (where L is the length of each train).
The difference in speed is 10 KMPH (46-36).
In 36 seconds at 10 KM the train will be able to cover 100 meters (36*100,000/3,600). If 2 L = 100 meters, L = 50 meters