<PRE><B>Question 421865</B>
Filling the tank is one job							
One pipe fills in 6	hours					
It does 	  1/ 6	of the job in 1 	hours				
other pipe 8 hours					
It does 	  1/ 8	of thejob in 1 	hours				
							
							
							
Together they will do  1/6+  1/8	of the job in 1 hour		
Together they will do   7/24 of the job in one hour			
So they will take 24/7 hours
OR 3.43 hours				
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