Question 257444
    A car travels a distance of 1742 miles at an average rate of 40 mph and returns at an average rate of 55 mph. Find the average rate for the round trip to the nearest tenth.
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Average rate = "total distance" / "total time"
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Total distance = 2(1742) = 3484 miles
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Applying the "distance formula" of d=rt
we can find the time traveled.
Going:
1742/40 = 43.55 hours
Returning:
1742/55 = 31.67 hours
Total time = 43.55+31.67 = 75.22 hours
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Avg rate = 3484/75.22 = 46.32 = 46.3 mph