acoopersmith

07-14-2009, 01:20 PM

Tina hiked up a 15km trail. The return trip took 30 min less due to a rate increase of 1km/hr. How long did the trip take?

I am having trouble setting up the equations. I know rate x time = distance, and the first equation should be :

(r) (15/r) = 15, but then I wind up getting a no answer when I try the 2 nd equation: (r+1)[(15/r+1) - 0.5] = 15. I just think the second one is wrong and I don't know why.

I am having trouble setting up the equations. I know rate x time = distance, and the first equation should be :

(r) (15/r) = 15, but then I wind up getting a no answer when I try the 2 nd equation: (r+1)[(15/r+1) - 0.5] = 15. I just think the second one is wrong and I don't know why.