An empty conical water container is placed on its base and water is poured into it through the vertex. It takes 20 minutes for the water level to rise to 40% of the height of the cone. How long will it take for the water level to rise to 70% of the height of the cone?
A: 22.8 minutes
B: 24.8 minutes
C: 35 minutes
D: 40 minutes
Answer: B
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