Question 316321
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Against the wind, the actual speed made good was 3960 divided by 6 equals 660 kilometers per hour.  The actual speed made good against the wind is also equal to the speed of the airplane in still air MINUS the speed of the wind.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ r_a\ -\ r_w\ =\ 660]


Similarly, considering the return trip:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ r_a\ +\ r_w\ =\ 792]


Add the two equations:


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 2r_a\ +\ 0r_w\ =\ 1452]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ r_a\ =\ 726]


You should be able to get the wind speed on your own from here.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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