Question 478034
Shoveling the snow		1 job				
Janet	50	minutes				
She does	  1/50	job in 1	hour			
Bill	45	minutes				
He does 	  1/45	of thejob in 1 	hour			
						
Together they will do 		  1/50	+	  1/45	+	
Together they will do 		  3/71	of the job in one hour
So they will take 		23 2/3	minutes