SOLUTION: Julio can fill a water tank in four minutes using a large hose. He takes 6 minutes using a smaller hose. How long will it take if he uses both hoses?

Question 176040: Julio can fill a water tank in four minutes using a large hose. He takes 6 minutes using a smaller hose. How long will it take if he uses both hoses?
Found 2 solutions by Mathtut, josmiceli:
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
large hose is 1/4 of the tank per minute
small hose is 1/6 of the tank per minute
:
together they can do:
:
(job)
:

:

:

:
minutes
:
so 2.4 minutes
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
You must add the rates to get the combined rate
In words:
{1 water tank/time to fill with large hose) + (1 water tank/time to fill with small hose) = (1 water tank)/(time to fill with both hoses)

multiply both sides by

It takes 2.4 minutes to fill the tank with both hoses
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