Andy makes a trip to a forest on his bicycle, and Bob does so on his motorcycle. Bob covers one mile 4 minutes faster than Andy does. They both spent two hours on their respective trips. However, Bob covered 40 miles more distance than did Andy. How many miles did Andy cover during his trip?

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What this question tests

Your application of distance = rate × time to trains, boats, and commuters, including relative speed.

Mixing units (miles per hour vs. minutes) or averaging speeds — average speed is total distance over total time.