document.write( "Question 1044966: airplane travels 5580 km against the wind in 9 hoirs and 6750 km with the wind in the same amount of time. what is the rate of the plane kn still air and what is the rate of the wind \n" ); document.write( "
Algebra.Com's Answer #660382 by Boreal(15235)\"\" \"About 
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p-w=5580/9=620 km/hr
\n" ); document.write( "p+w=6750/9=750 km/hr
\n" ); document.write( "add them
\n" ); document.write( "2p=1370
\n" ); document.write( "p=685 km/hr
\n" ); document.write( "substitute into first one
\n" ); document.write( "685-w=620
\n" ); document.write( "w=65 km/hr
\n" ); document.write( "check with second one
\n" ); document.write( "685+65=750
\n" ); document.write( "plane goes 620 km/hr in still air
\n" ); document.write( "the wind speed is 65 km/hr.
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