Question 419126
riding time =x
pedalling time = y

x+y = 7/2
2x+2y=7..............1

20x+12y=58...........2

...
								
multiply (1)by	-6			
Multiply (2) by 1			
-12	x	+	-12	y	=	-42		
20	x	+	12	y	=	58		
								
Add the two equations								
								
8x=16		
								
/8							
								
x=2						
								
plug value of x in (1)								
								
2x+2y=7		
4+2y=7		
2y=7-4
2y=3		
y=1.5	
X=2 
Distance = 2* 20 = 40 miles 	
it kicked out