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				Now, let’s try a more
				    advanced problem. 
				     
				    An inlet pipe can fill up a pool in
				    18 hours. The drain pipe can empty the pool in 30 hours. If the drain
				    pipe is accidentally
				      opened when the pool is half filled, how long will it take
				    to fill the pool? 
			         
			        Click on the Next  button to see the answer. | 
			   
			 
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