Thread: Need help with related rates

A water tank has the shape of an inverted cone with top radius 4 m and depth 10m. Waer is pored in to the tank at the rate of 5 m^3min^-1. How fast is the water rising when the depth of the water is 5 m?
i am not sure how to start

Originally Posted by supersaiyan

A water tank has the shape of an inverted cone with top radius 4 m and depth 10m. Waer is pored in to the tank at the rate of 5 m^3min^-1. How fast is the water rising when the depth of the water is 5 m?
i am not sure how to start

get the volume of water in the tank in terms of ...

note that

once you do that, take the derivative w/r to time and calculate