Which equations could be used to solve the problem?

A balloon, with a final volume of 40 cm3, took 4 min to fill. At what rate was the balloon filled?

Choose exactly two answers that are correct.

A.40 cm3 • r = 4 min

B.r – 4 h = 14 in.

C.40 cm3 = 4 min • r

D40*cm3/4 min=r