Math Olympiad for Elementary | 2014 | Division E | Contest 5 | MOEMS | 5D

Problem: Jimmy is filling up a pool using a large hose and a small hose. The large hose, working alone, could fill the pool in 3 hours. The small hose, working alone, could fill the pool in 5 hours. The small hose is turned on and allowed to run for an hour. Then the large hose is turned on, and both run until the pool is full. How many hours did it take to fill the pool?

Key: Use fractions to write equations

Please consider subscribing, here's our website link: https://inquisitivekids.github.io