2015 AMC 8 Problems/Problem 3
Jack and Jill are going swimming at a pool that is one mile from their house. They leave home simultaneously. Jill rides her bicycle to the pool at a constant speed of miles per hour. Jack walks to the pool at a constant speed of miles per hour. How many minutes before Jack does Jill arrive?
Solution
Jill arrives in of an hour, which is minutes. Jack arrives in of an hour which is minutes. Thus, the time difference is minutes.
Solution 2
Using , we can set up an equation for when Jill arrives at swimming:
Solving for , we get that Jill gets to the pool in of on hour, which translates to minutes. Doing the same for Jack, we get that
Jack arrives at the pool in of an hour, which in turn translates to minutes. Thus, Jill has to wait
minutes for Jack to arrive at the pool: Therefore, the answer is .
See Also
2015 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 2 |
Followed by Problem 4 | |
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All AJHSME/AMC 8 Problems and Solutions |
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