document.write( "Question 940666: The current of a river is 5 miles per hour. A boat travels between two points on the river. If it takes 2 hours to travel in one direction and 5/2 hours to travel in the other direction, what is the speed of the boat in still water? \n" ); document.write( "
Algebra.Com's Answer #573275 by stanbon(75887)\"\" \"About 
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The current of a river is 5 miles per hour. A boat travels between two points on the river. If it takes 2 hours to travel in one direction and 5/2 hours to travel in the other direction, what is the speed of the boat in still water?
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\n" ); document.write( "Downstream DATA:
\n" ); document.write( "distance = x miles ; time = 2 hrs ; rate = x/2 mph
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\n" ); document.write( "Upstream DATA:
\n" ); document.write( "distance = x miles ; time = 5/2 hrs ; rate = x/(5/2) mph
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\n" ); document.write( "Equation:
\n" ); document.write( "Down:: b + 5 = x/2
\n" ); document.write( "Up:::: b - 5 = (2x)/5
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\n" ); document.write( "Subtract and solve for \"x\"::
\n" ); document.write( "(x/2)-(2x/5) = 10
\n" ); document.write( "Multiply thru by 10 to get:
\n" ); document.write( "5x - 4x = 100
\n" ); document.write( "x = 100 miles
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\n" ); document.write( "Ans: Solve for \"b\"::
\n" ); document.write( "b + 5 = x/2
\n" ); document.write( "b + 5 = 50
\n" ); document.write( "boat speed = 45 mph
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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