document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1163274>Question 1163274</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello I need to learn formulas for distance word problems in algebra one. Here is an example of a question: Lewis ran to the store at 8 km/h and then walked home at 3 km/h. How far was it to the store, if the round trip took 11 hours? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #787318 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=787318\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Lewis ran to the store at 8 km/h and then walked home at 3 km/h. How far was it to the store, if the round trip took 11 hours?<BR>\n" );
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document.write( "d = distance to the store.<BR>\n" );
document.write( "time going = d/8 hours<BR>\n" );
document.write( "time back = d/3 hours<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d%2F8+%2B+d%2F3+=+11 ALIGN=MIDDLE  ALT=\"d%2F8+%2B+d%2F3+=+11\"   DISABLED_style= \"max-width:90%; height:auto;\" > hours<BR>\n" );
document.write( "3d + 8d = 264<BR>\n" );
document.write( "11d = 264<BR>\n" );
document.write( "d = 24 kms<BR>\n" );
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document.write( "24/8 + 24/3 = 3+8 = 11 hours<BR>\n" );
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document.write( "I need to learn formulas for distance word problems ---<BR>\n" );
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document.write( "That's not a formula, it's how you solve it.<BR>\n" );
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document.write( "For a formula, for any round-trip, or trip of 2 equal lengths:<BR>\n" );
document.write( "Avg speed = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2Ar%5B1%5D%2Ar%5B2%5D%2F%28r%5B1%5D%2Br%5B2%5D%29 ALIGN=MIDDLE  ALT=\"2%2Ar%5B1%5D%2Ar%5B2%5D%2F%28r%5B1%5D%2Br%5B2%5D%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Avg speed = 2*8*3/(8+3) = 48/11 km/hr<BR>\n" );
document.write( "avg speed*11 = 48 km round trip ---> 24 km each way<BR>\n" );
document.write( "Notice that the distance is not relevant to finding the avg speed.<BR>\n" );
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document.write( "There are a LOT of formulas.  Too many for anyone to remember them all.<BR>\n" );
document.write( "But, this one for average speed is similar to that of parallel resistors and parallel work, so it's not difficult to remember.\r<BR>\n" );
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