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← Problem 311: (2025 AMC 10b, 19; AMC 12b, 15) →
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Problem 311: (2025 AMC 10b, 19; AMC 12b, 15)
A container has a $1\times 1$ square bottom, a $3\times 3$ open square top, and four congruent trapezoidal sides, as shown. Starting when the container is empty, a hose that runs water at a constant rate takes $35$ minutes to fill the container up to the midline of the trapezoids. How many more minutes will it take to fill the remainder of the container? $\textbf{(A) }70 \qquad$ $ \textbf{(B) }85 \qquad$ $ \textbf{(C) }90 \qquad$ $ \textbf{(D) }95 \qquad$ $ \textbf{(E) }105$
Solution
Exercise 311: Solution
A bucket has the shape of a frustum of a cone, with a circular bottom of radius $2$ and an open circular top of radius $5$. Starting when the bucket is empty, a hose that runs water at a constant rate takes $38$ minutes to fill the bucket up to one third of its height. How many more minutes will it take to fill the rest of the bucket?
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