Question

Two pipes can separately fill a tank in 5 hours and 4 hours respectively. If both the pipes are
working together, in how much time will the tank be filled?
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Answer 1

Answer:

Let the tank be of 20 liters.

So, Pipe A fills 4 liters/ hour and Pipe b fills 5 liters/ hour.

Therefore, time taken when both fill together = 20 / (5 + 4) = 2.22 hours

Answer = 2.22 hours