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:

1) Let the length of each train be L km.

2) Relative speed of the trains:
46 km/hr – 36 km/hr = 10 km/hr

3) Convert to km/sec:
10 km/hr = 10 ÷ 3600 km/sec = 1/360 km/sec

4) Distance covered for complete passing = 2L (length of both trains)

5) Using Distance = Speed × Time:
2L = (1/360) × 36

6) Solving:
2L = 36/360 = 1/10
L = 1/20 km = 0.05 km = 50 meters

Thus, the length of each train is 50 meters.