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.


B.
40 cm3 = 4 min • r

C.
40 cm3 • r = 4 min

D.
r – 4 h = 14 in.

3 answers

rate of filling = 40 cm^3/4 min
= 10 cm^3/min
So, only B appears correct.

C would work, if you consider 0.1 min/cm^3 a rate. Usually rates are written with time in the denominator. If, however, you want to determine the time needed to fill 1 cm^3, then C will work.
D and B are correct