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Susan can wax her car in 2 hr(s). When she works together with Helga, they can wax the car in 30 minute(s). How long would it take Helga, working by herself, to wax the car?

Susan can wax her car in 2 hr(s). When she works together with Helga, they can wax the car in thirty min(s). How long would it take Helga, working by herself, t0 wax the car?

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