document.write( "Question 567226: How far can Phelps swim upstream at 8 km/hr and still return downstream at 12 km/hr in a total time of 4 hours? \n" ); document.write( "

Algebra.Com's Answer #366576 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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How far can Phelps swim upstream at 8 km/hr and still return downstream at 12 km/hr in a total time of 4 hours?
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\n" ); document.write( "Let d = one-way distance
\n" ); document.write( "write a time equation, time = dist/speed
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\n" ); document.write( "time up = time down = 4 hrs
\n" ); document.write( " $\"d%2F8\"$ + $\"d%2F12\"$ = 4
\n" ); document.write( "multiply by 24 to clear the denominators, resutls
\n" ); document.write( "3d + 2d = 24(4)
\n" ); document.write( "5d = 96
\n" ); document.write( "d = $\"96%2F5\"$
\n" ); document.write( "d = 19.2 km,
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\n" ); document.write( "Check this by finding the actual time each way
\n" ); document.write( "19.2/8 = 2.4 hrs
\n" ); document.write( "19.2/12= 1.6
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\n" ); document.write( "total; 4 hrs \n" ); document.write( "

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