Posted by **anonymous** on Saturday, April 28, 2007 at 12:37am.

andys average driving speed for a 4-hour trip was 45 miles per hour. during the first 3 hours he drove 40 miles per hour. what was his average speed for the last hour of his trip?

The trip length was 4 x 45 = 180 miles. He went 3x40 = 120 the first three hours. How many miles does that leave for the last hour?

4+5

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