Difference between revisions of "2007 AMC 12A Problems/Problem 4"

Revision as of 20:30, 3 July 2013

Problem

Kate rode her bicycle for 30 minutes at a speed of 16 mph, then walked for 90 minutes at a speed of 4 mph. What was her overall average speed in miles per hour?

$\mathrm{(A)}\ 7\qquad \mathrm{(B)}\ 9\qquad \mathrm{(C)}\ 10\qquad \mathrm{(D)}\ 12\qquad \mathrm{(E)}\ 14$

Solution

$16 \cdot \frac{30}{60}+4\cdot\frac{90}{60}=14$
$\frac{14}2=7\Rightarrow\boxed{A}$

2007 AMC 12A (Problems • Answer Key • Resources)
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All AMC 12 Problems and Solutions

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Difference between revisions of "2007 AMC 12A Problems/Problem 4"

Revision as of 20:30, 3 July 2013

Problem

Solution

See also