document.write( "Question 362366: a plane flies 435 miles with the wind and 345 miles against the wind in the same length of time . If the speed of the wind is 15mph , find the speed of the plane in still air \n" ); document.write( "

Algebra.Com's Answer #258276 by mananth(16946) $\"\"$ $\"About$

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a plane flies 435 miles with the wind and 345 miles against the wind in the same length of time . If the speed of the wind is 15mph , find the speed of the plane in still air
\n" ); document.write( "...
\n" ); document.write( "plane speed in still air = x mph
\n" ); document.write( "with wind speed = x+15
\n" ); document.write( "against wind speed = x-15.\r
\n" ); document.write( "\n" ); document.write( "..
\n" ); document.write( "time = distance /speed
\n" ); document.write( "with wind time = 435/x+15
\n" ); document.write( "against wind time = 345/x-15
\n" ); document.write( "..
\n" ); document.write( "times are same
\n" ); document.write( "..
\n" ); document.write( " $\"435%2F%28x%2B15%29+=+345%2F%28x-15%29%29\"$
\n" ); document.write( "435(x-15)=345(x+15)
\n" ); document.write( "435x-6525=345x+5175
\n" ); document.write( "435x-345x=6525+5175
\n" ); document.write( "90x=11700
\n" ); document.write( "x= 11700/90
\n" ); document.write( "x= 130 mph speed of plane in still air
\n" ); document.write( "...
\n" ); document.write( "m.ananth@hotmail.ca \n" ); document.write( "

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