document.write( "Question 375231: A motorboat goes 36 km downstream in the same amount of time it takes to go 24 km upstream. If the current is flowing 3 km/h, what is the speed of the boat in still water? \n" ); document.write( "
Algebra.Com's Answer #266914 by Fombitz(32388)\"\" \"About 
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Rate*Time=Distance
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\n" ); document.write( "\"R%2At=D\"
\n" ); document.write( "Let B be the speed of the boat.
\n" ); document.write( "With the current,
\n" ); document.write( "\"%28B%2B3%29%2At=36\"
\n" ); document.write( "\"t=36%2F%28B%2B3%29\"
\n" ); document.write( "Against the current,
\n" ); document.write( "\"%28B-3%29%2At=24\"
\n" ); document.write( "\"t=24%2F%28B-3%29\"
\n" ); document.write( "Equate the two times,
\n" ); document.write( "\"36%2F%28B%2B3%29=24%2F%28B-3%29\"
\n" ); document.write( "\"36%28B-3%29=24%28B%2B3%29\"
\n" ); document.write( "\"3%28B-3%29=2%28B%2B3%29\"
\n" ); document.write( "\"3B-9=2B%2B6\"
\n" ); document.write( "\"highlight%28B=15%29\"kph\r
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