Question 3
A water container has 2 different taps. If the container is full of water then it takes the red tap 4 hours to run alone until the container is empty. If the container is half full then it takes the blue tap 6 hours to run alone until the container is empty. If both taps are running, how long does it take to make a full container become empty?
Editorial modelling assumption: each tap drains at a constant rate, unchanged when both are open.
Editorial modelling assumption: each tap drains at a constant rate, unchanged when both are open.