Nola hiked down a trail at a steady rate for 10 minutes. her change in elevation was -200 ft. then she continued to hike down for another 20 minutes at a different rate. her change in elevation for this part of the hike was -300 ft. during which portion of did she walk down at a faster rate? explain your reasoning.

Her first rate was faster. The 10 minutes with a change in elevation of -200ft.
In order to solve this you need to have the same minutes. In this problem, I just simply took the 10 minutes and the -200ft and doubled it. Now both rates have 20 minutes. The first rate would have gone -400ft in 20 minutes while the second rate was only -300ft in 20 minutes. I hope this wasn't confusing, and I'm willing to explain more.