Given parameters:
Number of hours worked by Peter = 6.5hrs
Unknown:
Number of hours Joseph can work more than Peter =?
This problem is straight forward, the statement "his friend Joseph can work 1[tex]\frac{2}{3}[/tex]
is the solution to the problem.
Joseph can work 1[tex]\frac{2}{3}[/tex] more than Peter.
Overall, Joseph can work;
6.5hrs + 1[tex]\frac{2}{3}[/tex]hr = 8.2hrs