SOLUTION: One pipe can fill a tank in 0.8 hours and another pipe can fill the tank in 1.2 hours. If both pipes are used, how long will it take to fill the tank? Round to 2 decimal places

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Question 1056058: One pipe can fill a tank in 0.8 hours
and another pipe can fill the tank in 1.2
hours. If both pipes are used, how long
will it take to fill the tank? Round to 2
decimal places.

Found 3 solutions by josgarithmetic, Boreal, Alan3354:
Answer by josgarithmetic(39613)   (Show Source):
You can put this solution on YOUR website!
This is the rate, in tanks per hour:

Answer by Boreal(15235)   (Show Source):
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pipe A fills in 0.8 hours or 48 minutes
In 1 minute, it fills (1/48) of the tank.
pipe B fills in 1.2 hours or 72 minutes
in 1 minute, it fills (1/72) of the tank.
The time it takes for both is x minutes.
Therefore (x/48)+(x/72)=1 full tank
Multiply by 144, the common denominator.
3x+2x+144
5x=144 minutes
x=144/5=28.8 minutes

Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website!
One pipe can fill a tank in 0.8 hours
and another pipe can fill the tank in 1.2
hours. If both pipes are used, how long
will it take to fill the tank? Round to 2
decimal places.
------------
0.8*1.2/(0.8 + 1.2) hours
= 0.96/2 hours
= 0.48 hours