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English 8 Online
OpenStudy (anonymous):

You are flying on an airplane from Hanoi, Vietnam, to Manila, Philippines. After a few hours, the pilot announces that the plane has begun its descent at a constant rate to land at the Manila airport. After descending for 5 minutes, the plane's elevation is 10 kilometers. After descending for 15 minutes, its elevation is 6 kilometers. What is the total number of minutes that the plane spends descending before it lands?

OpenStudy (surryyy):

30 minutes

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