Mathematics, 22.11.2019 04:31, blueval3tine

Washing his dad's car alone, ian takes 5 hours. if his dad him, then it takes 2.5 hours. how long does it take ian's dad to wash the car by himself?

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Washing his dad's car alone, ian takes 5 hours. if his dad him, then it takes 2.5 hours. how long d...