Two water tanks, \(X\) and \(Y,\) were drained simultaneously. If \(X\) contained \(30\) more gallons of water than

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Two water tanks, \(X\) and \(Y,\) were drained simultaneously. If \(X\) contained \(30\) more gallons of water than \(Y,\) and both tanks became empty at the same time, how long did it take the tanks to empty?

1) For every gallon drained from tank \(Y,\) \(2\) gallons were drained from tank \(X\)

2) Tank \(Y\) was drained at a constant rate of \(20\) gallons per hour

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