Question 1112541

To mountains		x	mph		
From mountains		18	mph	faster	
returning speed		x	+	18	
returning time =		7	hours		
going out time=		10	hours		
					
Distance = same	

10	x	=	7	(	x	+	18	)	
10	x	=	7	x	+	126			
10	x	-	-7	x	=		126		
3	x	=		-50	126				
/	3								
x	=		42	mph					
									
Returning speed=60		mph

Distance = 42*10 =420 miles
OR
Distance = (42+18) * 7= 420 miles