Question 457494
A to B		x	mph		
B to A		15	mph 	slower	
returning speed		x-15	
returning time =		5	hours		
going out time=		3	hours		
					
Distance = same					
3	x	=	5	(	x		-15	)	
3	x	=	5	x	0	-75			
3	x	-	5	x	=		-75		
-2	x	=-75					
/	-2								
x=37.5	mph					
									
Returning speed=	22.5	mph