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?

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.

I think that when asking for help with homework you should show some of your own work and point out where you are having difficulty. Being handed the answer on a plate isn't going to help you pass your exams.

Originally posted by ThudanBlunder I think that when asking for help with homework you should show some of your own work and point out where you are having difficulty. Being handed the answer on a plate isn't going to help you pass your exams.

Okay here are the real figures.
R 45 cm
pump 27.3/min

4/3*pi*.45^3=0.381703507 (figure in m^3)
coversation to L (from m^3)= 1000*0.381703507
= 381.7035074
rate= 381.7035074/27.3
= 13.98181346min
rounds to about 14 min.
Answer is needed in min anyway.