Question 536422
steve speed= x
eve speed = 

when they are walking in same direction the effective speed = x-y

d=6.6
t=11 hours
t=d/r

11= 6.6/(x-y)
11x-11y=6.6
x-y=0.66-------------------1

when they are walking towards each other speed = x+y

1=6.6/(x+y)
x+y=6.6---------------------2

Add equation (1) & (2)
2x=7.20
x=3.6 mph ----- steve's speed
plug x in (1)
3.6-y=0.66
3.6-0.66=y
2.94 =y -----------eve's speed