Question
A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
Solution
1. The first tap alone fills half the tank in 3 hours. 2. With 4 taps running, the remaining half is filled in 1.5 hours. 3. Total time = 3 + 1.5 = 4.5 hours.
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