need some tips on an assignment... - XP Math - Forums

 XP Math - Forums need some tips on an assignment...

 09-09-2007 #1 problematicmethematician Guest   Posts: n/a need some tips on an assignment... i posted this on the wrong thread so i'll post it here...hehehe sorry okay i need to solve this for our class... but i don't want the answer (even if i badly need it hehehe ) i need tips and hints so i can answer it... i'm really bad at word probs so all your help will be appreciated much!!! In a long distance race covering 42km. one runner finished 12 min before another runner. If the faster runner's rate was 1km/hr more than the slower runner's, what were their rates?... thank a bunch!
 09-09-2007 #2 Sillysidley   Join Date: Oct 2006 Posts: 822 Let x be the slower guy's speed. Then, $\frac{42}{x}-\frac{42}{x+1}=\frac{1}{5}$. Solve it __________________ .
 09-09-2007 #3 problematicmethematician Guest   Posts: n/a okay... tried it but uhhh you lost me with 1/5..where did you get that?...
 09-09-2007 #4 Sillysidley   Join Date: Oct 2006 Posts: 822 Well, since we're talking about hours, and 12 min. is $\frac{1}{5}$ of an hour... __________________ .
 09-09-2007 #5 problematicmethematician Guest   Posts: n/a awww shucks..now i feel so ******!.. hehehe thanks.. i'll try it now... do i still need to use the quadratic formula with this?.... Last edited by Scion; 09-10-2007 at 04:04 PM..
 09-16-2007 #6 hunter34 Guest   Posts: n/a Yes because $(x)(x+1)=x^2+x$.

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