Problema Solution
A pool can be filled by one pipe in 8 hours and by a second pipe in 9 hours. How long will it take using both pipes to fill the pool?
It will take about ___ hours to fill the pool using both pipes. (Type an integer or decimal rounded to the nearest tenth.)
Answer provided by our tutors
pipe 1 fills full in 8 hours
pipe1 fills in 1 hr = 1/8 pool
pipe 2 fills in 9 hours
pipe 2 fills in 1 hour = 1/9 pool
both fills in 1 hour = 17/72 pool
both fili full pool in = 72/17 hour