College Physics Problem 1.23

If a marathon runner averages 9.5 mi/h, how long does it take him or her to run a 26.22-mi marathon?

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The relationship of the velocity (or speed), time and distance is

v=frac{d}{t}

So, by rearranging the equation, we can equate time to

t=frac{d}{v}

By direct substitution

t=frac{26.22  mi}{9.5  mi/hr}

t=2.8   hours

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