During a recent track meet, Peter ran x meters of the 100 meter dash in 9 seconds; running at the same rate, how many seconds will it take Peter to run z meters of the 200 meter dash?
Choose the correct option:
A) 9/xz
B) 9zx
C) 9x/z
D) 9z/x
E) xz/9
Speed of Peter = x/9 meters per second   Time needed to run z meters = 9z/xISTANCE/SPEE9z/x = z / (x/9) =9z/x   Option 9z/x   The values 100m and 200m have no role to play here and are just given to confuse you.
<result>D</result>
During a recent track meet, Peter ran x meters of the 100 meter dash in 9 seconds; running at the same rate, how many seconds will it take Peter to run z meters of the 200 meter dash?