document.write( "Question 1050412: the boat goes downstream at 13 kph
\n" ); document.write( "upstream it goes three kph
\n" ); document.write( "what is the speed of the current?
\n" ); document.write( "It is obvious it is ten kph, but how do you put this into an equation? \n" ); document.write( "

Algebra.Com's Answer #665969 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+c+\"$ = the speed of the current
\n" ); document.write( "Let $\"+s+\"$ = the speed of the boat in still water
\n" ); document.write( "(1) $\"+s+%2B+c+=+13+\"$
\n" ); document.write( "(2) $\"+s+-+c+=+3+\"$
\n" ); document.write( "Add the equations:
\n" ); document.write( " $\"+2s+=+16+\"$
\n" ); document.write( " $\"+s+=+8+\"$
\n" ); document.write( "and
\n" ); document.write( "(1) $\"+8+%2B+c+=+13+\"$
\n" ); document.write( "(1) $\"+c+=+5+\"$
\n" ); document.write( "The speed of the current is 5 km/hr
\n" ); document.write( "---------------
\n" ); document.write( "check answer:
\n" ); document.write( "(2) $\"+s+-+c+=+3+\"$
\n" ); document.write( "(2) $\"+8+-+c+=+3+\"$
\n" ); document.write( "(2) $\"+c+=+5+\"$
\n" ); document.write( "OK
\n" ); document.write( "You can get a 2nd opinion if you want\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

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