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 The length of each train is

• A. 50 m
• B. 72 m
• C. 80 m
• D. 82 m

Answer 1

Answer: (A)

50 m

Let the length of each train be x metres
Then, distance covered = 2x metres.
Relative speed $=(46-36)km/hr$
$=[10\times \frac{5}{18}\times 10]m\setminus sec$
$=\left[\frac{25}{9}\right]m\setminus sec$
$\therefore \frac{2x}{36}=\frac{25}{9}$
$\Rightarrow x=\frac{36\times 25}{9\times 2}$
$\Rightarrow x=50$
Hence the length of each train is 50m.