Question 159366
the 8 hp does 1/8 the job in 1 hr.
the 3 hp does 1/12 the job in 1 hr.
4/8 + 4/12 + x/12 =1
12/24 + 8/24 + x/24 =24/24
x=4
4/24=2/12
so it will take 2 more hrs for the 3 hp pump to finish.
.
Ed