document.write( "Question 301797: A helicopter goes 720 miles with the wind in the same time it can go 630 miles against
\n" ); document.write( "the wind. The speed of the wind is 6 miles per hour. Find the speed of the helicopter
\n" ); document.write( "with no wind. \n" ); document.write( "
Algebra.Com's Answer #216449 by mananth(16946)\"\" \"About 
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A helicopter goes 720 miles with the wind in the same time it can go 630 miles against the wind. The speed of the wind is 6 miles per hour. Find the speed of the helicopter with no wind.\r
\n" ); document.write( "\n" ); document.write( "let the speed if the helicopter in still air be x\r
\n" ); document.write( "\n" ); document.write( "aginst wind it will be x-6 mph2\r
\n" ); document.write( "\n" ); document.write( "time taken = 630 / x-6\r
\n" ); document.write( "\n" ); document.write( "with wind it will be x+6 mph\r
\n" ); document.write( "\n" ); document.write( "time taken = 720 / x+6\r
\n" ); document.write( "\n" ); document.write( "630 / x-6 = 720 / x+6\r
\n" ); document.write( "\n" ); document.write( "630(x+6) = 720(x-6)\r
\n" ); document.write( "\n" ); document.write( "630x+3780 = 720x-4320\r
\n" ); document.write( "\n" ); document.write( "-90x=-8100\r
\n" ); document.write( "\n" ); document.write( "x=-9100/-90\r
\n" ); document.write( "\n" ); document.write( "x= 90 mph\r
\n" ); document.write( "\n" ); document.write( "Ananth\r
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