At an isolated mountain camp, Emek and Tara discovered that a damaged water line was filling the storage tank too slowly. A gauge showed that only 7.5 liters had collected in 6 minutes. The camp needed 150 liters before the next group arrived in 90 minutes. Tara used the proportion 7.5/6 = 150/x and found that the tank would need 120 minutes to collect enough water at the current rate. That was 30 minutes beyond their deadline. Emek calculated that they needed a rate of 150/90, or about 1.67 liters per minute, instead of the current 1.25 liters per minute. They adjusted a partly closed valve and tested the line again. This time, the gauge collected 10 liters in 6 minutes, giving a rate of about 1.67 liters per minute. At that rate, 150 liters would take 90 minutes. They checked the proportion once more, then left the repaired line running. The tank reached the required level just as the arriving group approached the camp.