Tap A can fill an empty tank in 4 hours and tap B can empty it in 5 hours. How long will it take to fill the tank, if both the taps are opened together?
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Tap A can fill an empty tank in 4 hours and tap B can empty it in 5 hours. How long will it take to fill the tank, if both the taps are opened together?
Answer:
In 3 hour both taps are opened together
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