A train travels 300 metres in 15 seconds. What is its speed in km/h?

Step-by-step solution

1. Compute speed in metres per second: $v=\frac{300\text{ m}}{15\text{ s}}=20\text{ m/s}$.
2. Convert $20\text{ m/s}$ to km/h using factor $3.6$ (since $1\text{ m/s}=3.6\text{ km/h}$).
3. $20\times 3.6=72\text{ km/h}$.
4. Hence the train’s speed is $72$ kilometres per hour.

Concept tested: Speed conversion between units

Published 1 October 2026 · How this solution was prepared and checked