Mathematics, 05.06.2020 10:59 sza2016

Janet can wax her car in 2 hr(s). When she works together with Helga, they can wax the car in 45 min(s). How long would it take Helga, working by herself, to wax the car?

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Janet can wax her car in 2 hr(s). When she works together with Helga, they can wax the car in 45 mi...

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