document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=895508>Question 895508</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A man travel 20 km at 40 km/h ,10km at 30 km pH and 30 km at 60 km pH determine the average speed? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #542911 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=542911\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A man travels 20 km at 40 km/h, 10km at 30 km pH, and 30 km at 60 km pH<BR>\n" );
document.write( " determine the average speed?<BR>\n" );
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document.write( "Total distance = 20 + 10 + 30 = 60 km<BR>\n" );
document.write( "Let a = the average speed of the whole trip<BR>\n" );
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document.write( "Write a time equation; time = dist/speed<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20%2F40 ALIGN=MIDDLE  ALT=\"20%2F40\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2F30 ALIGN=MIDDLE  ALT=\"10%2F30\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30%2F60 ALIGN=MIDDLE  ALT=\"30%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60%2Fa ALIGN=MIDDLE  ALT=\"60%2Fa\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "multiply equation by 120a, cancel the denominators and you have<BR>\n" );
document.write( "(3a(20) + 4a(10) + 2a(30) = 120(60)<BR>\n" );
document.write( "60a + 40a + 60a = 7200<BR>\n" );
document.write( "160a = 7200<BR>\n" );
document.write( "a = 7200/160<BR>\n" );
document.write( "a = 45 km/hr is the average speed<BR>\n" );
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document.write( "Check this by finding the time<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20%2F40 ALIGN=MIDDLE  ALT=\"20%2F40\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=10%2F30 ALIGN=MIDDLE  ALT=\"10%2F30\"   DISABLED_style= \"max-width:90%; height:auto;\" > + <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=30%2F60 ALIGN=MIDDLE  ALT=\"30%2F60\"   DISABLED_style= \"max-width:90%; height:auto;\" > = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=60%2F45 ALIGN=MIDDLE  ALT=\"60%2F45\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( ".5 + .33 + .5 = 1.33<BR>\n" );
document.write( " </SPAN>\n" );
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