A train 150 m long runs at 54 km/h. How long does it take to cross a platform 300 m long?

Explanation

1. 01

   Distance to cover = train + platform = $150 + 300 = 450$ m.

2. 02

   54 km/$h = 15$ m/s.

3. 03

   Time $= \frac{450}{15} = 30$ s.