A runner in a marathon passes the 8-mile mark at 2 o'clock and the 21-mile mark at 4 o'clock. What is the runner's average speed (in mph) during this time period?

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter1: Introduction And Vectors
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A runner in a marathon passes the 8-mile mark at 2 o'clock and the 21-mile mark at 4 o'clock. What is the runner's average speed (in mph) during this time period?

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