document.write( "Question 418323: If a boat goes downstream 72 miles in 3 hours and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water are ?\r
\n" ); document.write( "\n" ); document.write( "I tried this with table and found c = 7mph and r = 17mph \n" ); document.write( "

Algebra.Com's Answer #292763 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"c\"$ rate of boat in still water
\n" ); document.write( "Let $\"r\"$ = rate of river
\n" ); document.write( "given:
\n" ); document.write( "downstream:
\n" ); document.write( " $\"+72+=+%28c+%2B+r%29+%2A+3+\"$
\n" ); document.write( "(1) $\"24+=+c+%2B+r+\"$
\n" ); document.write( "upstream:
\n" ); document.write( " $\"+60++=+%28c+-+r%29+%2A+6+\"$
\n" ); document.write( "(2) $\"10+=+c+-+r+\"$
\n" ); document.write( "Add (1) and (2)
\n" ); document.write( " $\"34+=+2c+\"$
\n" ); document.write( " $\"c+=+17\"$
\n" ); document.write( "and
\n" ); document.write( " $\"24+=+17+%2B+r+\"$
\n" ); document.write( " $\"r+=+7\"$
\n" ); document.write( "You just used $\"r\"$ for the boat and $\"c\"$ for the river
\n" ); document.write( "Same answer -OK \n" ); document.write( "

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