document.write( "Question 1138664: An 8-man rowing crew rows at a speed of 10 miles per hour in still water. every morning they practice bt rowing 4 miles upstream and then 4 miles downstream. If it takes them 5/6 of an hour to complete the trip what is the speed of the current? \n" ); document.write( "

Algebra.Com's Answer #756465 by ikleyn(52810) $\"\"$ $\"About$

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document.write( "The \"time\" equation is\r\n" );
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document.write( "     +  =    of an hour.\r\n" );
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document.write( "    4*6*(10-c) + 4*6*(10+c) = 5*(10+c)*(10-c)\r\n" );
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document.write( "    240 - 24c + 240 + 24c   = 5*(100-c^2)\r\n" );
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document.write( "     480                    = 500 - 5c^2\r\n" );
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document.write( "     5c^2 = 500 - 480\r\n" );
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document.write( "     5c^2 = 20\r\n" );
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document.write( "     c^2   = 20/5 = 4\r\n" );
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document.write( "     c =  = 2.\r\n" );
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document.write( "ANSWER.  The speed of the current is 2 miles per hour.\r\n" );
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