Lesson: Challenging Problem Solving - 21t05

Rates: Average Rates And Combined Rates, Continued

Review the following average rate problem and then proceed to the task below.

Use the average rate formula to solve the question above. First try to find distance and rate for the first leg of the trip. Enter the correct values into the textboxes below, and then click Continue.

Distance 1: Time 1: _____

Now do the same for Distance 2 and Time 2.

Distance 2: Time 2: _____

Now solve for the average speed. Select the correct answer below and then click Continue.

A motorist travels 90 miles at a rate of 20 miles per hour. If he returns the same distance at a rate of 40 miles per hour, what is the average speed for the entire trip, in miles per hour?

	20
	30

Solving the above equation, we find:

Choice (C) is correct.

 

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