Tap A can fill a tank in 2 hours. Outlets B and C can empty a tank in 4 hours and 6 hours respectively. If the tank is empty and A and B are turned on, how long will it take to fill up ? After the tank is full. A, B and C are all turned on , how long will the tank take to empty?
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Tap A can fill a tank in 2 hours. Outlets B and C can empty a tank in 4 hours and 6 hours respectively. If the tank is empty and A and B are turned on, how long will it take to fill up ? After the tank is full. A, B and C are all turned on , how long will the tank take to empty?
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sorry i don't know the answer