For this case we can raise a rule of three based on Anthony trotting
miles in 23 minutes.

miles -----------> 23 minutes
x ----------------------------------------> 1minute

ANswer:
0.5 miles per minute
This problem cannot be solved unless we are given figure NPQR is a rhombus.
In that case, then all sides are equal, meaning
5x+16=9x-32
Solve for x
9x-5x=16+32
4x=48
x=12
Each side (including PQ) then equals 5x+16=5*12+16=76