average speed from 3 different speeds (V Soros Olympiad 1998-99 Round 2 10.1)
Source:
May 25, 2024
algebra
Problem Statement
A car drove from one city to another. She drove the first third of the journey at a speed of km/h, the second third at km/h, and the last third at km/h. What is the average speed of the car along the entire journey?