2009 AMC 10A Problems/Problem 4

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Problem

Eric plans to compete in a triathlon. He can average $2$ miles per hour in the $\frac{1}{4}$ -mile swim and $6$ miles per hour in the $3$ -mile run. His goal is to finish the triathlon in $2$ hours. To accomplish his goal what must his average speed in miles per hour, be for the $15$ -mile bicycle ride?

$\mathrm{(A)}\ \frac{120}{11}\qquad\mathrm{(B)}\ 11\qquad\mathrm{(C)}\ \frac{56}{5}\qquad\mathrm{(D)}\ \frac{45}{4}\qquad\math...$

Solution

$\longrightarrow \fbox{A}$

2009 AMC 10A (Problems • Resources)
Preceded by Problem 3	Followed by Problem 5
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25

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2009 AMC 10A Problems/Problem 4

From AoPSWiki

Problem

Solution

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