Question

One hose can nil a small swimming pool in 70 minutes. A larger hose can fill the pool in 55 minutes, How long will it take the two hoses to fill the pool working together?

Answer 1

x = 30.8 minutes

Explanation:

Let x = time (mins) it takes for both

x(1/70 + 1/55) = 1

multiplying both sides by (70)(55):

x(55 + 70) = (70)(55)

x(125) = 3850

x = 30.8 minutes

OR

x = 30 minutes and 48 seconds