Difference between revisions of "2007 AMC 12A Problems/Problem 4"
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Revision as of 10:16, 9 September 2007
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?
Solution
- 16*(30/60)+4*(90/60)=14
- 14/2=7
