A 200 m long passenger train at 70 km/h overtakes a 150 m long goods train moving at 52 km/h on a parallel track in the same direction. How long does the overtaking take?

Explanation

1. 01

   Same direction: relative speed = $70 - 52 = 18$ km/$h = 5$ m/s.

2. 02

   To pass completely, the faster train covers both lengths: $200 + 150 = 350$ m.

3. 03

   Time $= \frac{350}{5} = 70$ s.