Question

Two trains travel in the same direction at 50 km/hr and 32 km/hr respectively. A man in the slower train observes that the faster train passes him completely in 15 seconds. What is the length of the faster train in metres?

Answer 1

Since the trains travel in the same direction, relative speed of the trains = (50 – 32) km/hr = 18 km/hr.

= \(\bigg(18\times\frac{5}{18}\bigg)\) m/x = 5 m/s

∴ Length of the faster train = Speed × Time 

= (5 × 15) m = 75 m.