document.write( "Question 947422: a salmon swims 100 m in 8min downstream upstream it would take the fish 20 min. what is the rate of the current and the speed of the fish. \n" ); document.write( "
Algebra.Com's Answer #578111 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"+s+\" = the speed of the fish in meters/min
\n" ); document.write( "Let \"+c+\" = the speed oif the current in meters/min
\n" ); document.write( "----------------------
\n" ); document.write( "Equation for downstream:
\n" ); document.write( "(1) \"+100+=+%28+s+%2B+c+%29%2A8+\"
\n" ); document.write( "Equation for upstream:
\n" ); document.write( "(2) \"+100+=+%28+s++-+c+%29%2A20+\"
\n" ); document.write( "--------------------------
\n" ); document.write( "(1) \"+s+%2B+c+=+25%2F2+\"
\n" ); document.write( "and
\n" ); document.write( "(2) \"+s+-+c+=+5+\"
\n" ); document.write( "--------------------
\n" ); document.write( "Add the equations
\n" ); document.write( "\"+2s+=+10%2F2+%2B+25%2F2+\"
\n" ); document.write( "\"+2s+=+35%2F2+\"
\n" ); document.write( "\"+s+=+35%2F4+\"
\n" ); document.write( "\"+s+=+8.75+\"
\n" ); document.write( "and
\n" ); document.write( "(1) \"+35%2F4+%2B+c+=+25%2F2+\"
\n" ); document.write( "(1) \"+c+=+50%2F4+-+35%2F4+\"
\n" ); document.write( "(1) \"+c+=+15%2F4+\"
\n" ); document.write( "(1) \"+c+=+3.75+\"
\n" ); document.write( "The speed of the fish is 8.75 meters/min
\n" ); document.write( "The speed oif the current is 3.75 meters/min
\n" ); document.write( "----------------
\n" ); document.write( "check:
\n" ); document.write( "(2) \"+s+-+c+=+5+\"
\n" ); document.write( "(2) \"+8.75+-+3.75+=+5+\"
\n" ); document.write( "(2) \"+5+=+5+\"
\n" ); document.write( "and
\n" ); document.write( "(1) \"+100+=+%28+s+%2B+c+%29%2A8+\"
\n" ); document.write( "(1) \"+100+=+%28+8.75+%2B+3.75+%29%2A8+\"
\n" ); document.write( "(1) \"+100+=+12.5%2A8+\"
\n" ); document.write( "(1) \"+100+=+100+\"
\n" ); document.write( "OK
\n" ); document.write( "
\n" ); document.write( "
\n" );