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Mathematics, 14.02.2022 14:00 Arm2005

Washing his dad's car alone, Jared takes 7 hours.  If his dad helps him, then it takes 2 hours.  How long does it take Jared's dad to wash the car by himself?

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Washing his dad's car alone, Jared takes 7 hours.  If his dad helps him, then it takes 2 hours.  How...
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