Team awesome starts hiking up from base camp which is located at 4400 feet at a steady rate of 600 feet/hour. at the same time, team cool, which has hiked up earlier, leaves the top of the peak at 8900 feet and starts hiking down at a steady rate of 900 feet/hour. after how many hours do the two teams pass each other? I'd like to learn how to set up this equation to solve it! Thanks