document.write( "Question 1104348: A motorboat takes
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Algebra.Com's Answer #719107 by ikleyn(52788) $\"\"$ $\"About$

You can put this solution on YOUR website!
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\n" ); document.write( "A motorboat takes 5 hours to travel 150mi going upstream. The return trip takes 3 hours going downstream.
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document.write( "Let x=rate of boat in still water\r\n" );
document.write( "let c=rate of current\r\n" );
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document.write( "Then (x+c) is the rate of boat downstream\r\n" );
document.write( "     (x-c) is the rate of boat upstream\r\n" );
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document.write( "rate = \r\n" );
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document.write( "Rate upstream    x-c = .\r\n" );
document.write( "Rate downstream  x+c = .\r\n" );
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document.write( "Simplify:\r\n" );
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document.write( "x - c = 30     (1)\r\n" );
document.write( "x + c = 50     (2)\r\n" );
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document.write( "Add the equations (1) and (2). You will get\r\n" );
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document.write( "2x = 30 + 50 = 80  ====>  x =  = 40.\r\n" );
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document.write( "Answer.  Rate of the boat in still water = 40 mph.\r\n" );
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document.write( "         Rate of current = 10 mph.\r\n" );
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\n" ); document.write( "It is a typical and standard Upstream and Downstream round trip word problem.\r
\n" ); document.write( "\n" ); document.write( "You can find many similar fully solved problems on upstream and downstream round trips with detailed solutions in lessons \r
\n" ); document.write( "\n" ); document.write( "    - Wind and Current problems \r
\n" ); document.write( "\n" ); document.write( "    - More problems on upstream and downstream round trips \r
\n" ); document.write( "\n" ); document.write( "    - Wind and Current problems solvable by quadratic equations \r
\n" ); document.write( "\n" ); document.write( "    - Unpowered raft floating downstream along a river\r
\n" ); document.write( "\n" ); document.write( "    - Selected problems from the archive on the boat floating Upstream and Downstream \r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "Read them attentively and learn how to solve this type of problems once and for all.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this textbook under the section \"Word problems\", the topic \"Travel and Distance problems\".\r
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\n" ); document.write( "\n" ); document.write( "Save the link to this online textbook together with its description\r
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\n" ); document.write( "\n" ); document.write( "Free of charge online textbook in ALGEBRA-I
\n" ); document.write( "https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson\r
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\n" ); document.write( "\n" ); document.write( "to your archive and use it when it is needed.\r
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