Question 308471
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If he averaged 16 mph for the first 20 miles, then *[tex \Large \frac{20}{16}\ =\ 1.25] hours have elapsed.  Since he wants to complete the race in *[tex \Large 2.5 ] hours, there are *[tex \Large 2.5\ -\ 1.25\ =\ 1.25] hours remaining.  He has *[tex \Large 30] miles to go.  So he has to have a rate of *[tex \Large \frac{30}{1.25}\ =\ 24] miles per hour.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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