document.write( "Question 176337: Flying against the jetstream, a jet travels 4440km in 6 hours. Flying with the jetstream, the same jet travels 8540 km in 7 hours. What is the speed of the jet in still air, and what is the speed of the jetstream?
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Algebra.Com's Answer #131452 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Rate multiplied by time equals distance.
\n" ); document.write( " $\"R%2AT=D\"$
\n" ); document.write( "Call the speed of the jet, $\"R%5Bj%5D\"$ , and the speed of the jet stream, $\"R%5Bs%5D\"$ , then,
\n" ); document.write( "1. $\"%28R%5Bj%5D-R%5Bs%5D%29%286%29=4440\"$ Jet speed minus jet stream speed
\n" ); document.write( "2. $\"%28R%5Bj%5D%2BR%5Bs%5D%29%287%29=8540\"$ Jet speed plus jet stream speed
\n" ); document.write( "Re-arrange eq.1 and eq. 2,
\n" ); document.write( "1. $\"R%5Bj%5D-R%5Bs%5D=4440%2F6=740\"$
\n" ); document.write( "2. $\"R%5Bj%5D%2BR%5Bs%5D=8540%2F7=1220\"$
\n" ); document.write( "Then add them together,
\n" ); document.write( " $\"R%5Bj%5D-R%5Bs%5D%2BR%5Bj%5D%2BR%5Bs%5D=1960\"$
\n" ); document.write( " $\"2R%5Bj%5D=1960%29\"$
\n" ); document.write( " $\"R%5Bj%5D=980%29\"$
\n" ); document.write( "From eq. 2,
\n" ); document.write( " $\"R%5Bj%5D%2BR%5Bs%5D=1220\"$
\n" ); document.write( " $\"980%2BR%5Bs%5D=1220\"$
\n" ); document.write( " $\"R%5Bs%5D=240\"$
\n" ); document.write( "The jet travels at 980 km/hr while the jet stream moves at 240 km/hr. \n" ); document.write( "

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