Problema Solution
two inlet pipes can fill an empty swimming pool in 3 days and 6 days respectively a pump can empty the full pool in 4 days how long will it take to fill the empty pool if both pipes are open and the pump is open?
Answer provided by our tutors
let 'x' be the time in days needed for the pool to be filled if all the pipes and the pump are working
1/3 + 1/6 - 1/4 = 1/x
1/4 = 1/x
x = 4 days
the answer is 4 days.