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2006 AMC 8 Question 3

AMC8 · 2006 AMC 8

Question 3

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?
  1. $\dfrac{1}{2}$
  2. $\dfrac{3}{4}$
  3. $1$
  4. $2$
  5. $3$