SOLUTION: at an aquarium two different pipes can be used to fill one of the large tanks. Pipe A can fill the tank in 7 hours. Pipe B can fill tank in 9 hours. The aquariums manager would lik

Question 609756: at an aquarium two different pipes can be used to fill one of the large tanks. Pipe A can fill the tank in 7 hours. Pipe B can fill tank in 9 hours. The aquariums manager would like to fill the tank in less than 4 ours. Is it possible to do this by using both pipes at the same time ? explain ?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
At an aquarium two different pipes can be used to fill one of the large tanks.
Pipe A can fill the tank in 7 hours. Pipe B can fill tank in 9 hours.
The aquariums manager would like to fill the tank in less than 4 ours.
Is it possible to do this by using both pipes at the same time?
:
See how long (t) it would take with both pipes filling the tank
Let the full tank = 1
:
+ = 1
multiply by 63, results
9t + 7t = 63
t =
t = 3.9375 hrs. the answer is yes.

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