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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:

50 m
72 m
80 m
82 m
Explanation:

Let the length of each train be $ x $ metres.

Then, distance covered = 2$ x $ metres.

Relative speed = (46 - 36) km/hr

   =$ \left(10 \times\dfrac{5}{18} \right) $m/sec
   =$ \left(\dfrac{25}{9} \right) $m/sec
$\therefore \dfrac{2x}{36} $=$ \dfrac{25}{9} $

$\Rightarrow$ 2$ x $ = 100

$\Rightarrow x $ = 50.

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