Question 1140355
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<pre>
{{{400/2.5}}} = 160 mph is the speed of the airplane against the wind, which is   u - v, 

where u is the speed of the airplane in still air, v is the speed of the wind.


So, one equation is

    u - v = 160.    (1)



{{{200/((50/60))}}} = 240 mph is the speed of the airplane with the wind, which is u + v.


So, the other equation is

    u + v = 240.    (2)


From equations (1) and (2)  you get (using elimination or substitution method)


u = 200 mph;   v = 40 mph.     <U>ANSWER</U>
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Solved.