Mathematics: Fran can clean the garage in 3hours, but it takes angie 4hours to do the same job. how long would it take them to clean the garage if they worked together?

Fran can clean the garage in 3hours, but it takes

Ответ:

lakinbacon4

04.01.2022

Fran can clean $\frac{1}{3}$ of garage in one hour. Angie can clean $\frac{1}{4}$ of garage in one hour. Working together they can clean
$\dfrac{1}{3}+\dfrac{1}{4}=\dfrac{7}{12}$ of the garage in one hour.
Whole garage will be cleaned in $\frac{12}{7}=1\frac{5}{7}$ hours. (approx. 1 hour and 43 minutes)