document.write( "Question 385552: at full speed, a motor boat can travel 32 miles upstream in 8 hours, but it can travle the same distance downstram in 4 hours. What is the rate of the current in miles per hour. \n" ); document.write( "

Algebra.Com's Answer #272765 by stanbon(75887) $\"\"$ $\"About$

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At full speed, a motor boat can travel 32 miles upstream in 8 hours, but it can travel the same distance downstram in 4 hours. What is the rate of the current in miles per hr.
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\n" ); document.write( "Upstream DATA:
\n" ); document.write( "distance = 32 miles; time = 8 hrs ; rate = 32/8 = 4 mph
\n" ); document.write( "-----
\n" ); document.write( "Downstream DATA:
\n" ); document.write( "distance = 32 miles ; time = 4 hrs ; rate = 32/4 8 mph
\n" ); document.write( "-----
\n" ); document.write( "Equation:
\n" ); document.write( "Let boat speed = b
\n" ); document.write( "Let current speed = c
\n" ); document.write( "---
\n" ); document.write( "b-c = 4
\n" ); document.write( "b+c = 8
\n" ); document.write( "---
\n" ); document.write( "2b = 12
\n" ); document.write( "b = 6 mph (speed of the boat in still water)\
\n" ); document.write( "----
\n" ); document.write( "Since b + c = 8, c = 2 mph
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\n" ); document.write( "cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( "============================= \n" ); document.write( "

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