Instantaneous water heater

Water flows into and out of an instant water heater simultaneously. If water only flows in, the empty heater would be filled in 18 minutes. If water only flows out, the full heater would be emptied in 20 minutes. How many minutes will it take to fill the empty heater if both the inlet and outlet are open at the same time?

Final Answer:

t =  180 min

Step-by-step explanation:

t1=18 min t2=20 min  m=t11t21=181201=180101809=180109=18010.0056  t=1/m=1/0.0056=180 min



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