Given:
Ronald complete the job = 2 hours
With the help of Donald, then complete the job = 1 hours
Find:-
How long, in hours and minutes, would it take Donald to shovel the driveway alone?
Sol:-
Ronald can complete the job in 2 hours, so the unit rate is:
[tex]=\frac{1}{2}[/tex]Of the job per hour.
Let x be the unit rate of Donald.
So,
[tex]\frac{1}{2}+x=\frac{1}{1}[/tex]The value of "x" is:
[tex]\begin{gathered} \frac{1}{2}+x=1 \\ \\ x=\frac{1}{1}-\frac{1}{2} \\ \\ x=\frac{1}{2} \end{gathered}[/tex]So Donald has a unit rate of 1/2 which means we would complete the job in 2 hours, too
