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Mathematics, 01.11.2019 04:31 shakebays

On their trip to washington, dc, jen and her parents drove 3 hours at a speed of 60 mph and then 3 hours at a speed of 40 mph. driving back, they spent the same time. what was their driving speed on the way back?

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On their trip to washington, dc, jen and her parents drove 3 hours at a speed of 60 mph and then 3 h...
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