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One hose can fill a goldfish pond in 84 minutes, and two hoses can fill the same pond in 35 minutes. Find how long it takes the second hose alone to fill the pond.

Respuesta :

35/84 + 35/x = 1
Multiply by 84x, results
35x + 84(35) = 84x
2940 = 84x - 35x
2940 = 49x
x = 2940/49
x = 60 min for the 2nd hose alone
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