document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1157574>Question 1157574</A>: <I><SPAN STYLE=\"word-break: break-all;\"> To get to his parents' house, John must travel at a speed of 60 mph on land and then use a motorboat that travels at a speed of 20 mph in still water. John goes by land to a dock and then travels on a river against a current of 4 mph. He reaches his parent's home in 4.5 hours. The return trip takes him 3.5 hours. How far do his parents live from his house?\r<BR>\n" );
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document.write( "The time spent on land is the same for both legs or the trip.  The 1 hour difference between the times for the two legs is the difference in the time going upstream against the current and the time returning downstream with the current.<br><BR>\n" );
document.write( "The upstream speed is 20-4=16mph; the downstream speed is 20+4-24mph.  Determine the distance on the river if the upstream trip takes 1 hour more than the downstream trip.<br><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%2F16-x%2F24+=+1 ALIGN=MIDDLE  ALT=\"x%2F16-x%2F24+=+1\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3x-2x=48 ALIGN=MIDDLE  ALT=\"3x-2x=48\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+48 ALIGN=MIDDLE  ALT=\"x+=+48\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "The distance on the river is 48 miles.<br><BR>\n" );
document.write( "Determine the amounts of time for the upstream and downstream trips.<br><BR>\n" );
document.write( "Upstream: 48/16 = 3 hours<BR>\n" );
document.write( "Downstream: 48/24 = 2 hours<br><BR>\n" );
document.write( "Determine the distance on land, now knowing that the trip on land took 1.5 hours at 60mph: 1.5(60) = 90<br><BR>\n" );
document.write( "The total distance is 48+90 = 138 miles.<br><BR>\n" );
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