1 answer
(click or scroll down)
To find out how long it will take them to finish the floor working together, we need to combine their individual rates of work.
Joan's rate of work is 1/12 of the floor per hour.
Jett's rate of work is 1/9 of the floor per hour.
Their combined rate of work is 1/12 + 1/9 = 3/36 + 4/36 = 7/36 of the floor per hour.
Therefore, working together, they can complete 7/36 of the floor per hour.
To find out how long it will take them to finish the entire floor, we take the reciprocal of their combined rate:
1 / (7/36) = 36/7 โ 5.14 hours
So, it will take Joan and Jett approximately 5.14 hours to finish the floor working together.