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Mathematics 16 Online
OpenStudy (anonymous):

translate to a system of equations and solve an airplane flew for 4 hrs against a head wind of 40km/h. on the return flight the same wind was now a tail wind, and the flight took 3 hrs. find the speed of the airplane in still air (help please !)

OpenStudy (anonymous):

(r + 40)*3 = (r - 40)*4

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