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Let the length of the longer piece be 3x units. Then the length of the shorter piece is 2x units.
According to the given information, we have:
3x + 2x = \sqrt(250)
5x = \sqrt(250)
x = \frac{\sqrt(250)}{5}
x = \sqrt(10)
Therefore, the length of the longer piece is 3x = 3 * \sqrt(10) = \sqrt(100) = 10 units.