Curated OER
The I-81 Problem
In this problem solving learning exercise, students determine the average rate of speed of a car traveling 60 miles per hour one direction and 30 miles per hour on the return trip. A detailed answer is included with the problem.
The Math League
The Math League: Ratio and Proportion
Detailed explanations of ratio, comparing ratios, proportion, rate, converting rates, and average rate of speed, all with examples.
The Math League
The Math League: Ratio
This site gives a definition of a ratio along with two word problems. Also shows the student how to compare ratios using fractions.