Question 1040149
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if an airplane has a tail wind, the wind increases the speed of the plane by that amount. 
Similarly, a headwind decreases the speed of a plane by that amount. Suppose a plane which can fly 
at 250 mph in no wind flies 350 miles in head wind and 390 in a tail wind. What is the speed of the wind.
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Hey,


your condition is wrong.
There is a mistake in your condition. (May be, more than one mistake!)
Read it and find a mistake.