Emek and Tara reached a remote canyon with 7.5 liters of water remaining. At a trail marker, they learned that hikers should plan for 2.4 liters of water for every 6 kilometers in the canyon. The direct route to the next supply station was 18 kilometers long. Tara set up the proportion 2.4/6 = x/18 and found that x = 7.2 liters. Their 7.5 liters would be enough, but only 0.3 liter would remain. A second route was safer from falling rocks but was 20 kilometers long. Emek used the same rate to calculate that this route would require 8 liters of water, which was 0.5 liter more than they carried. They checked both results against the guide's rate of 0.4 liter per kilometer. Since only the 18-kilometer route could be completed with their current supply, they chose the direct path, carefully monitored their water at each checkpoint, and reached the supply station safely.