document.write( "Question 509029: Randy can row upstream at 4 mph and downstream at 10mph. If the round trip from Randys home upstream to Sandys home (and back) takes 9.5 hours then about how far apart are their homes? \n" ); document.write( "

Algebra.Com's Answer #341373 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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Randy can row upstream at 4 mph and downstream at 10mph.
\n" ); document.write( " If the round trip from Randys home upstream to Sandys home (and back) takes 9.5 hours then about how far apart are their homes?
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\n" ); document.write( "Let d = the one-way distance
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\n" ); document.write( "Write a time equation; time = dist/speed
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\n" ); document.write( "up time + down time = 9.5 hrs
\n" ); document.write( " $\"d%2F4\"$ + $\"d%2F10\"$ = 9.5
\n" ); document.write( "multiply by 20 to clear the denominators
\n" ); document.write( "5d + 2d = 20*9.5
\n" ); document.write( "7d = 190
\n" ); document.write( "d = 27.14 ~ 27 miles apart
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\n" ); document.write( "Check this solution find the time for each way
\n" ); document.write( "27/4 = 6.75
\n" ); document.write( "27/10= 2.70
\n" ); document.write( "------------
\n" ); document.write( "total: 9.45 ~ 9.5
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