A tourist covers 120 km at 30 km/h and then covers 180 km at 45 km/h. Find the average speed for the entire journey.

Step-by-step solution

1. 1. Compute time for first leg: $t_1=\frac{120}{30}=4$ h.
2. 2. Compute time for second leg: $t_2=\frac{180}{45}=4$ h.
3. 3. Total distance $D=120+180=300$ km.
4. 4. Total time $T=t_1+t_2=4+4=8$ h.
5. 5. Average speed $V=\frac{D}{T}=\frac{300}{8}=37.5$ km/h.

Concept tested: average speed over composite journey

Published 4 October 2026 · How this solution was prepared and checked