Question : 15 taps can fill a tank in 36 minutes. How many taps will be required to fill the tank in one hour?
Option 1: 12
Option 2: 9
Option 3: 8
Option 4: 6
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Correct Answer: 9
Solution : According to the question, 15 taps can fill the tank in 36 minutes $M{_1}T{_1} = M{_2}T{_2}$, where $M{_1}$ and $M{_2}$ are the number of taps required in both the cases and $T{_1}$ and $T{_2}$ are the time taken ⇒ $15\times 36=M{_2}\times 60$ ⇒ $M{_2} = \frac{15\times 36}{60}$ ⇒ $M{_2} = 9$ Hence, the correct answer is 9.
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