Question 866305
running speed------------x
walking speed------------y

t=d/r
8/x + 2/y = 5/6 ( hours)
4/x + 6/y = 5/4 (hours)

let 1/x = a and 1/y =b

8a+2b=5/6
4a+6y=5/4

8      	a	+	2      	b 	=	  5/ 6	.............1	
Total value								
4      	a	+	6      	b 	=	5/ 4	.............2	
Eliminate	y							
multiply (1)by		-3      						
Multiply (2) by		1      						
-24      	a		-6      	b 	=	-5/ 2		
4      	a	+	6      	b 	=	5/ 4		
Add the two equations								
-20      	a				=	-5/ 4		
/	-20      							
a	=	  1/16						
plug value of			a	in (1)				
8      	a	+	2      	b 	=	  5/ 6		
  1/ 2		+	2      	b 	=	  5/ 6		
			2      	b 	=	  5/ 6		-1
			2      	b 	=	  1/ 3		
				b 	=	  1/ 6		
a=	  1/16	. Therefore x =16 km/h	running	speed				
b=	  1/ 6	Therefore y = 6  km/h	walking	speed				
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