document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=397878>Question 397878</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A man can run 3 kilometers faster than he walks. It takes him 4 hours to run 30 kilometers. How long would it take him to walk the same distance? </SPAN>\n" );
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document.write( "It takes him 4 hours to run 30 kilometers.<BR>\n" );
document.write( "so run speed v1=30/4=7.5 (km/h)<BR>\n" );
document.write( "then walk speed v2=7.5-3=4.5<BR>\n" );
document.write( "so it would take him to walk the same distance t2=30/4.5=20/3(h)=6h40min </SPAN>\n" );
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