2006 AMC 8 Problems/Problem 3: Difference between revisions
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== Solution == | == Solution == | ||
When Elisa started, she finished a lap in <math> \frac{25}{10}=2.5 </math> minutes. Now, she finishes a lap is <math> \frac{24}{12}= 2 </math> minutes. The difference is <math> 2.5-2=\boxed{\textbf{(A)}\ \frac{1}{2}} </math>. | When Elisa started, she finished a lap in <math> \frac{25}{10}=2.5 </math> minutes. Now, she finishes a lap is <math> \frac{24}{12}= 2 </math> minutes. The difference is <math> 2.5-2=\boxed{\textbf{(A)}\ \frac{1}{2}} </math>. | ||
{{AMC8 box|year=2006|num-b=2|num-a=4}} | |||
Revision as of 15:00, 21 November 2011
Problem
Elisa swims laps in the pool. When she first started, she completed 10 laps in 25 minutes. Now, she can finish 12 laps in 24 minutes. By how many minutes has she improved her lap time?
Solution
When Elisa started, she finished a lap in 
minutes. Now, she finishes a lap is 
minutes. The difference is 
.
| 2006 AMC 8 (Problems • Answer Key • Resources) | ||
| Preceded by Problem 2 |
Followed by Problem 4 | |
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