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Rob can tar a roof in nine hours.One day his friend Kayla helped him and it only took hime 4.74 hours. How long would it take Kayla to do it alone

Verified Answer :

ljeeps82

9x10.014084507 / 9 + 10.014084507 = 4.74

 90.126760563 / 19.014084507= 4.74

4.74 = 4.74

therefore  Kayla can do it in 10.01 hrs

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