document.write( "Question 347785: When a boat travels upstream (against the current), it takes 2 hours to travel 12 kilometers. The return trip downstream (with the current) takes 1 hour. Find the speed of the boat in still water and the rate of the current. \n" ); document.write( "

Algebra.Com's Answer #248661 by josmiceli(19441) $\"\"$ $\"About$

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Downstream:
\n" ); document.write( "rate = $\"s+%2B+c\"$
\n" ); document.write( " $\"12+=+%28s+%2B+c%29%2A1\"$
\n" ); document.write( "Upstream:
\n" ); document.write( "rate = $\"s+-+c\"$
\n" ); document.write( " $\"12+=+%28s+-+c%29%2A2\"$
\n" ); document.write( "--------------
\n" ); document.write( "(1) $\"s+%2B+c+=+12\"$
\n" ); document.write( " $\"2s+-+2c+=+12\"$
\n" ); document.write( "(2) $\"s+-+c+=+6\"$
\n" ); document.write( "Add (1) and (2)
\n" ); document.write( " $\"2s+=+18\"$
\n" ); document.write( " $\"s+=+9\"$
\n" ); document.write( " $\"s+%2B+c+=+12\"$
\n" ); document.write( " $\"c+=+12+-+9\"$
\n" ); document.write( " $\"c+=+3\"$
\n" ); document.write( "The speed of the boat in still water
\n" ); document.write( "is 9 km/hr
\n" ); document.write( "The speed of thr current is 3 km/hr \n" ); document.write( "

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