*Originally posted by Knight Square*

**I have some questions to ask you guys.
**

There is a balloon with a radius of 45cm.

There is a pump that fills at a rate of 27.3L/s.

How long will it take to fill up the balloon (answer in min plz)?

For some reason I got around 14 min where did i go wrong?

Volume of a sphere: (4/3)pi*r^3

You get cm^3 = mL.

Divide the mL by 1000 (or multiply the pump speed by 1000) and the units will match. Now divide the volume by the pump's rate.

You get seconds. Now divide by 60 to get minutes.