Question
Tap A can fill up a tank in 9 hours. Tap B can fill up the same tank in 10 hours. How long will it take to fill up the tank if both taps are turned on at the same time? Express your answer(s) in h.
3 m

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Tap A can fill up a tank in 9 hours. Tap B can fill up the same tank in 10 hours. How long will it take to fill up the tank if both taps are turned on at the same time? Express your answer(s) in h.