Help with Pipe Flow: Tank Filling Proportion in 3 Hours

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A storage tank is replenished by an inflow pipe which can fill it in 8 hours.If the tank is initially full and the outflow pipe can empty it in 12 hours,what proportion of the tank is full after 3 hours duration?
 
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What's the rate at which fluid flows into the tank? Out of the tank? (Express both rates in units of Tankfulls per hour.) What's the net rate of inflow?
 
Doc not really clear about it
 
One pipe flows into the tank at a rate of 1 tank per 8 hours. Express this in Tanks/hour.
 
Is it emptying and filling at the same time? In this case the tank would be OVERFLOWING
1/8 - 1/12 = 1/24 of the whole tank volume every hour.
 

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