Question 45

If 5 similar pipes can fill a tank in 2 hours 8 minutes, then in how much time 8 similar pipes will fill the tank?

Solution

2 hours 8 minutes is 128 minutes, so the tank needs $$5 \times 128 = 640$$ pipe-minutes. With 8 pipes it takes $$\frac{640}{8} = 80$$ minutes. That is 1 hour 20 minutes.

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