Question 456650
Roberto speed = xmph
Juanita speed = y mph
same direction so subtract speed 
effective speed = x-y
time = d/r

6.6/(x-y)=11

11x-11y=6.6.....1


Opposite direction
add up speeds
effective speed = x+y
time = 6.6/(x+y)
6.6/(x+y)=1
x+y=6.6..........2

11x-11y	=6.6	.............1	
x+y=6.6	.............2	
								
multiply (1)by 		1						
Multiply (2) by		11						
11x-11y=6.6		
11x+11y	=72.6		
Add the two equations								
22x=79.2		
/22							
x=3.60	mph					
plug value of 			x	in (1)				
11x-11y=6.6		
39.6-11y=6.6		
-11y=6.6-39.6
-11y=-33		
y=3.00 mph