LoL Very simple probleme no need of derivatives

1000=(1/3)*(PI)*(H^3)
H1=9.847450218

You add 10 feet cube for 1 minute

1010=(1/3)*(PI)*(H^3)
H2=9.88016624

H2-H1=.03271602179

The height increase of .03271602179 feet per minute