Question
Tap M can fill a tank completely in 6 hours while Tap N takes 2 hours more to fill the same tank completely. There is a hole at the bottom of the tank which can empty the full tank in 7 hours. How long does it take for the tank to be completely filled if both taps are turned on? Give your answer in whole number or decimal.
3 m

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Tap M can fill a tank completely in 6 hours while Tap N takes 2 hours more to fill the same tank completely. There is a hole at the bottom of the tank which can empty the full tank in 7 hours. How long does it take for the tank to be completely filled if both taps are turned on? Give your answer in whole number or decimal.