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TheWiseOrange
Answer: 4.8 hours

Explanation:

One hose can fill a pool in 12 hours.
The other house can fill the same pool in 8 hours.

If they fill the pool together, 
 [tex]\text {Time Needed } = \cfrac{12 \times 8}{12 + 8} = 4.8 hours [/tex]

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