Question

Question #73c96

Answer 1

I use a "model" like this: `T/(A1)+T/(A2) =1` where T = together time, and A1 and A2 represent the different alone times, and there is 1 job to be done.

Explanation:

Therefore, `(T/8)+(T/4)=1`
Multiply both sides by 8: `8(T/8+T/4)=(1)8`

So, T + 2T = 8, 3T = 8, so T = `8/3` hours or 2 and`2/3` hours.