Question 288771
There is more info than needed. We don't need the measurements of the garden.
x/3+x/4=1
4x+3x=12
7x=12
x=12/7
They can complete the job in 12/7 hours
12/7 = 1 5/7=1hour and 43 minutes= 1.7 hours


Dad will do 4/7 and son will do 3/7 of the job