Rod A is
9
10
m long.
It is
1
8
m longer than Rod B.
Rod C is
1
10
m shorter than Rod B.
What is the length of Rod C in fractions?
Rod B is 10 m long (9 m + 8 m = 17 m).
Therefore, Rod C is 7 m long (10 m - 3 m = 7 m).
Thus, the length of Rod C in fractions is 7/1.