document.write( "Question 839076: #1:
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\n" ); document.write( "A cruise boat travels 12 miles downstream in 4 hours and returns to its starting point upstream in 6 hours.
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Algebra.Com's Answer #505517 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi
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document.write( "The speed of a stream is 6mph
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document.write( "If a boat travels 54 miles downstream in the same time that it takes to travel 27 miles upstream, 
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document.write( "what is the speed  of the boat in still water?
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document.write( "D = rt  0r   t = D/r
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document.write( "Question states***
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document.write( "   |Cross Multiply to solve for x\r
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document.write( "A cruise boat travels 12 miles downstream in 4 hours and returns to its starting point upstream in 6 hours. 
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document.write( " Find the speed of the stream
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document.write( "  (r+c)4hrs = 12mi
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document.write( "  ((r-c)6hrs = 12mi
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document.write( " 4r + 4c = 12
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document.write( " 6r - 6c = 12
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document.write( "Solving for r by Elimination of c:
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document.write( " 24r + 24c = 72
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document.write( " 24r - 24c = 48
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document.write( "    48r = 120
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document.write( "      r = 2.5mph, speed of boat in still water   (current =  .5mph) \n" );
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