Question 419664
Car speed	100	mph					
Police car speed	120	mph					
Difference in time=			15 minutes = 1/4 hour
Car will have covered		25	miles	befor police car starts
catch up distance=		25	miles				
catch up speed =		120	-100	mph			
catch up speed =		20	mph				
							
Catchup time = catchup distance/catch up speed							
catch up time=		25	/	20			
catch up time=		1.25	hours