Hello, i'm not exactly sure how to do this one.

Water is draining for a conical filter into a cylindrical cup at the rate of 10 cubic centimeters per minute. The conical filter measures 10 cm tall and 10 cm across its top. The diameter of the cylindrical cup is 15 cm.

(a) How fast is the level of water in the filter falling when the water in the filter is 8 cm deep?

(b) At the same time as in part a, how fast is the level of water in the cup rising?

I can somewhat get it, but I need a start and some explanation. Thanks a lot.