document.write( "Question 1035209: When an airplane flies with a given wind, it can travel 3500km in 5 hours. When the same airplane flies in opposite direction against the wind it takes 7 hours to fly the same pldistance. Find the air speed of the plane and the speed of the wind \n" ); document.write( "

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\n" ); document.write( "When an airplane flies with a given wind, it can travel 3500km in 5 hours. When the same airplane flies in opposite direction against the wind it takes 7 hours to fly the same pldistance. Find the air speed of the plane and the speed of the wind
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Let speed, in still air be S, and windspeed, W
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document.write( "Then _____S + W = 700 ------ eq (i)
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document.write( "Also, _____S – W = 500 ------ eq (ii)
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document.write( "2S = 1,200 -------- Adding eqs (ii) & (i)
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document.write( "S, or speed in still air = \r
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document.write( "600 + W = 700 -------- Substituting 600 for S in eq (i)
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document.write( "W, or windspeed = 700 – 600, or  \n" );
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