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Analyzing related rates problems: equations

Πρόβλημα

Zhenghao was given this problem:
The radius r(t) of a sphere is decreasing at a rate of 1 meter per hour. At a certain instant t0, the radius is 4 meters. What is the rate of change of the volume V(t) of the sphere at that instant?
Which equation should Zhenghao use to solve the problem?
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