# Homework Help: Find average flow rate

1. Nov 7, 2008

### jerryez

1. The problem statement, all variables and given/known data
A room measures 3.5m by 4.5m by 6.0m. If the heating and air conditioning ducts to and from the room are circular with diameter of 0.30m and all the air in the room is to be exchanged every 12 min, (a) what is the average flow rate ?

2. Relevant equations
A1*V1=A2*V2

3. The attempt at a solution
I can find the area of the conditioning duct. Im not sure how to find the velocity of the air or the area of the room. Is it saying the room is a traingle shape? HELP

2. Nov 7, 2008

### montoyas7940

It is simpler than that. The rate IS the volume of the whole room every 12 minutes.

3. Nov 7, 2008

### montoyas7940

Do you know how to calculate the volume?
Width times length times height.

4. Nov 7, 2008

### jerryez

Thankyou so much montoyas7940!!!! I figured it out thanks to your help. I am so happy! I found the volume of the room by what you said and then I just converted it to meters cubed per second because it was meters cubed per 12minutes.