Answer:
Step-by-step explanation:
we know that
Jim can do the work in 5 days
so
The 100% of the work in 5 days
by proportion
Find out how much can do in 2 days
Let
x ----> the percentage of the work in 2 days
Remember that
Jim and his dad can do the work in 2 days
so
The 100% of the work in 2 days
Jim in 2 days can do 40% of the work
therefore
His dad in 2 days can do (100%-40%)=60%
by proportion
Find out how long would it take his father to build it alone
Let
x -----> the time it take his father to build it alone
Convert to mixed number