Answer:
Bella can complete work alone in 120 minutes
Step-by-step explanation:
Ana and Bella together can complete the shoveling in 30 minutes.
They can do a part of work in 1 minute = [tex]\frac{1}{30}[/tex]
Ana can do work alone in 40 minutes
She can do part of work in 1 minute = [tex]\frac{1}{40}[/tex]
So, Bella can do a part of work in 1 minute = [tex]\frac{1}{30}-\frac{1}{40}[/tex]
= [tex]\frac{1}{120}[/tex]
Bella can do [tex]\frac{1}{120}[/tex] part of work in 1 minute
Bella can do whole work in minutes = 120
Hence Bella can complete work alone in 120 minutes
