Question 419132
Sally paints She	4	hours	
It does  1/ 4	of the job in 1 hour
John paints in 6 hours	
He  does  1/ 6	of thejob in 1 	hours
			
Together they will do   5/12 of the job in 1 hour	
So they will take 2 2/5	hours
So they will take 2.4	hours