Question 694208
Sara	45	mph				
Son	55	mph				
Sara		07:00				
Son		07:30				
Difference in time=		00:30	=>	0.50	hours	
Sara	will have covered	22.50	miles		Son	starts
catch up distance=		22.50	miles			
catch up speed =		55	-45			
catch up speed =		10	mph			
Catchup time = catchup distance/catch up speed						
catch up time=		2.25				
catch up time=		2.25	hours			
They will meet at		9:55	am	mph