Ap Calc. Related Rates Problem.?

The size of a cylinder changes with time. If r increases at the rate of 2 cm/min and h decreases at the rate of 8 cm/min, at what rate is the volume changing at the instant when r = 1 cm and h = 5 cm? I have never really understood related rates problems. do you use the area of a cylinder as well as volume... show more The size of a cylinder changes with time. If
r increases at the rate of 2 cm/min and h
decreases at the rate of 8 cm/min, at what
rate is the volume changing at the instant
when r = 1 cm and h = 5 cm?

I have never really understood related rates problems. do you use the area of a cylinder as well as volume to find the answer? Please help me and show me the steps. Thanks!
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