document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=593007>Question 593007</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. Mike can row in still water at a speed twice that of the current in a certain river. It takes Mike 2 hours more to row 10 km up the river than it takes him to row 15 km down the river. What is the speed of current in the river?\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #376219 by </B><A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><B>ankor@dixie-net.com(22740)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ankor@dixie-net.com><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=ankor@dixie-net.com><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=376219\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. Mike can row in still water at a speed twice that of the current in a certain river.<BR>\n" );
document.write( " It takes Mike 2 hours more to row 10 km up the river than it takes him to row 15 km down the river.<BR>\n" );
document.write( " What is the speed of current in the river?<BR>\n" );
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document.write( "Let r = speed of current of the river<BR>\n" );
document.write( "It states, \"row in still water at a speed twice that of the current\", therefore<BR>\n" );
document.write( "2r = his rowing speed in still water<BR>\n" );
document.write( "Then<BR>\n" );
document.write( "2r - r = r, effective speed upstream<BR>\n" );
document.write( "2r + r = 3r, effective speed downstream<BR>\n" );
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document.write( "Write time equation<BR>\n" );
document.write( "Upriver time - downriver time = 2 hrs<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2Fr ALIGN=MIDDLE  ALT=\"10%2Fr\"   DISABLED_style= \"max-width:90%; height:auto;\" > - <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2F%283r%29 ALIGN=MIDDLE  ALT=\"15%2F%283r%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 2<BR>\n" );
document.write( "multiply by 3r<BR>\n" );
document.write( "3r*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2Fr ALIGN=MIDDLE  ALT=\"10%2Fr\"   DISABLED_style= \"max-width:90%; height:auto;\" > - 3r*<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=15%2F%283r%29 ALIGN=MIDDLE  ALT=\"15%2F%283r%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 3r(2)<BR>\n" );
document.write( "Cancel the denominators<BR>\n" );
document.write( "3(10) - 15 = 6r<BR>\n" );
document.write( "30 - 15 = 6r<BR>\n" );
document.write( "15/6 = r<BR>\n" );
document.write( "r = 2.5 km/hr is the speed of the current<BR>\n" );
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document.write( "Check that out, rowing speed in still water will be 5 km/hr, find the times<BR>\n" );
document.write( "10/2.5 = 4hrs<BR>\n" );
document.write( "15/7.5 = 2hrs<BR>\n" );
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document.write( "difference: 2 hrs </SPAN>\n" );
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