Question

One hose can fill a pool in 12 hours. another hose can fill the same pool in 8 h

Answer 1

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, 
 $\text {Time Needed } = \cfrac{12 \times 8}{12 + 8} = 4.8 hours$