document.write( "Question 1127384: The speed of a stream is 5 mph. A boat travels 7 miles upstream in the same time it takes to travel 17 miles downstream. What is the speed of the boat in still water? \n" ); document.write( "

Algebra.Com's Answer #743780 by ikleyn(52835) $\"\"$ $\"About$

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document.write( "The time equation is\r\n" );
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document.write( "     = .\r\n" );
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document.write( "    7*(x+5) = 17*(x-5)\r\n" );
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document.write( "    7x +35 = 17x - 85\r\n" );
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document.write( "    35 + 85 = 17x - 7x\r\n" );
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document.write( "    120 = 10x\r\n" );
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document.write( "    x = 120/10 = 12.\r\n" );
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document.write( "Answer.  The speed of the boat in still water is 12 miles per hour.\r\n" );
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