document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1110579>Question 1110579</A>: <I><SPAN STYLE=\"word-break: break-all;\"> bill can row 3 mph in still water. it takes him 3 hours and 36 minds to go 3 miles upstream and return. find the speed of the current.  </SPAN>\n" );
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document.write( "3 hours 36 minutes is 3 3/5 hours, or 18/5 hours.<br><BR>\n" );
document.write( "Let c be the rate of the current.  Then Bill's speed upstream is 3-c, and his speed downstream is 3+c.<br><BR>\n" );
document.write( "He is going 3 miles upstream and then 3 miles back; his total time is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2F%283-c%29%2B3%2F%283%2Bc%29 ALIGN=MIDDLE  ALT=\"3%2F%283-c%29%2B3%2F%283%2Bc%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  So<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2F%283-c%29+%2B+3%2F%283%2Bc%29+=+18%2F5 ALIGN=MIDDLE  ALT=\"3%2F%283-c%29+%2B+3%2F%283%2Bc%29+=+18%2F5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%283%2Bc%29%2B3%283-c%29+=+%2818%2F5%29%283-c%29%283%2Bc%29 ALIGN=MIDDLE  ALT=\"3%283%2Bc%29%2B3%283-c%29+=+%2818%2F5%29%283-c%29%283%2Bc%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=9%2B3c%2B9-3c+=+%2818%2F5%29%289-c%5E2%29 ALIGN=MIDDLE  ALT=\"9%2B3c%2B9-3c+=+%2818%2F5%29%289-c%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=18+=+%2818%2F5%29%289-c%5E2%29 ALIGN=MIDDLE  ALT=\"18+=+%2818%2F5%29%289-c%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+=+9-c%5E2 ALIGN=MIDDLE  ALT=\"5+=+9-c%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2+=+4 ALIGN=MIDDLE  ALT=\"c%5E2+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c+=+2 ALIGN=MIDDLE  ALT=\"c+=+2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "Answer: the speed of the current is 2 mph. </SPAN>\n" );
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