Solve the problem.Jill is 20 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 2 km/hr. They meet in 4 hours. How fast is Joe walking?
A. 7 km/hr
B. 12 km/hr
C. 2.5 km/hr
D. 3 km/hr
Answer: D
Mathematics
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A. y = 
x
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D. y = 
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; B = 
; C = 
. Find A
What will be an ideal response?
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A. 
B. ?
C. (-?, ?)
D. 
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