document.write( "Question 1180023: Bubba was boating down the river. He realize that in half the time it took him to go 84 miles downstream, he could go 18 miles upstream. If the boat could travel 15 mph in still water, how fast was the current? \n" ); document.write( "

Algebra.Com's Answer #809608 by mananth(16946) $\"\"$ $\"About$

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Bubba was boating down the river. He realize that in half the time it took him to go 84 miles downstream, he could go 18 miles upstream. If the boat could travel 15 mph in still water, how fast was the current?\r
\n" ); document.write( "\n" ); document.write( "the current speed be x
\n" ); document.write( "boat speed in still water = 15 mph\r
\n" ); document.write( "\n" ); document.write( "with current (15+x) mph 84 miles
\n" ); document.write( "against current (15-x) mph 18 miles\r
\n" ); document.write( "\n" ); document.write( "time with current 84/(15+x)
\n" ); document.write( "time against current 18/(15-x)\r
\n" ); document.write( "\n" ); document.write( "1/2 *84/(15+x) = 18/(15-x)
\n" ); document.write( "42/(15+x)= 18/(15-x)
\n" ); document.write( "42(15-x)= 18(15+x)\r
\n" ); document.write( "\n" ); document.write( "630-42x = 270 +18x\r
\n" ); document.write( "\n" ); document.write( "60x = 360
\n" ); document.write( "x=6\r
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