document.write( "Question 508978: Flying with a tailwind a jet can fly 2520 miles in 4 hours. Flying against the same wind, it covers 1720 miles in the same amount of time. Determine the speed of the jet in calm air. \n" ); document.write( "

Algebra.Com's Answer #341216 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"p\"$ = speed of the jet in calm air
\n" ); document.write( "Let $\"w\"$ = speed of wind
\n" ); document.write( "given:
\n" ); document.write( "(1) $\"+p+%2B+w+=+2520%2F4+\"$
\n" ); document.write( "(2) $\"+p+-+w+=+1720%2F4+\"$
\n" ); document.write( "-------------------
\n" ); document.write( "(1) $\"+p+%2B+w+=+630+\"$
\n" ); document.write( "(2) $\"+p+-+w+=+430+\"$
\n" ); document.write( "Add the equations
\n" ); document.write( " $\"+2p+=+1060+\"$
\n" ); document.write( " $\"+p+=+530+\"$
\n" ); document.write( "and, since
\n" ); document.write( "(2) $\"+p+-+w+=+430+\"$
\n" ); document.write( "(2) $\"+530+-+w+=+430+\"$
\n" ); document.write( "(2) $\"+w+=+530+-+430+\"$
\n" ); document.write( "(2) $\"+w+=+100+\"$
\n" ); document.write( "The speed of the jet in calm air is 530 mi/hr \n" ); document.write( "

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