Rudy runs 5 miles at a rate of 10 minutes per mile. Later he runs 4 miles at a rate of 9.5 minutes per mile. What is the total length of time that Rudy runs?
Let’s work this out in a step by step way to be sure we have the right answer.
88
Rudy first runs for 5 * 10 = 50 minutes.

Then Rudy runs for 4 * 9.

5 = 38 minutes.

Rudy runs for a total length of 50 + 38 = 88 minutes.

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Therefore, the answer is 88