Question 453010
Mowing the lawn=		1 job				
Joanne	40	minutes				
She does	  1/40	job in 1	minute			
hope	50	minutes				
He does 	  1/50	of thejob in 1 	minute			
						
Together they will do   1/40	+ 1/50	
Together they will do   4/89	of the job in one minute
So they will take 		22 2/9	minutes			
So they will take 		22.22	minutes