<PRE><B>Question 421963</B>
Jake flew his plane 500 miles against the wind in the same time as it took him to fly 700 miles with the wind. If the speed of the wind is 40 mph, what was the speed of the plane?
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a = airspeed of the plane
700 = (a+40)*t
500 = (a-40)*t
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t = 700/(a+40) = 500/(a-40)
700*(a-40) = 500*(a+40)
700a - 28000 = 500a + 20000
200a = 48000
a = 240 mi/hr
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