Peter uses the equation Y=13/4x to model the number of miles that he has walked in x hours.Which statement is true about the proportional relationship that is modeled by peter's equation?
A:Peter walks a rate of 4/13 miles per hour.
B:Peter walks at a rate of 4 miles per hour.
C:Peter walks at a rate of 13/4 miles per hour.
D:Peter walks at a rate of 13 miles per hour.
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