Answer
a.
b. 60hrs
Step-by-step explanation:
Let the time Molli will take to pint the room to be = t
Thus the amount of room that Molli can paint in 1 hour= 1/m
The amount of room John can paint is 1 hour= 1/12
The amount of room Rick can paint in 1 hour = 1/15
The equation for working together at a rate x time per work done will be;
You multiply by 6 in the three terms of the equation because it takes 6 hours for John, Rick and Molli to complete painting.
multiply by 10m in every part of the expression because 10m is the Least Common Multiple(LCM) is this case
<u>Collect like terms and find value of m</u>
Molli will take 60 hours to paint the room if working alone