Tributaries

The first tributary fills the pool with water in 15 hours.
The second tributary fills the pool in 10 hours. For how many hours is the pool filled with both tributaries?

Correct answer:

x =  6 h

Step-by-step explanation:

a=15 h b=10 h  x (a1+b1)=1 x (151+101)=1  x (1/15+1/10)=1  5x=30  x=530=6  x=6=6 h



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