document.write( "Question 1100024: An airplane flies to San Francisco from Los Angeles in 4 hours. It flies back in 3 hours. If the wind is blowing from the north at a velocity of 20 mph during both flights, what was the airspeed of the plane (its speed in still air)? \n" ); document.write( "

Algebra.Com's Answer #714497 by josgarithmetic(39618) $\"\"$ $\"About$

You can put this solution on YOUR website!
$\"system%28%28r-w%29%2A4=d%2C%28r%2Bw%29%2A3=d%29\"$ \r
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\n" ); document.write( "\n" ); document.write( " $\"4%28r-20%29=3%28r%2B20%29\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"4r-80=3r%2B60\"$ \r
\n" ); document.write( "\n" ); document.write( " $\"highlight%28r=140%29\"$ \n" ); document.write( "

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