This is a letterbox, please don't take the stamp
At the posted coordinates you will find a sign.
The final is at:
N39 16.96X W84 23.0GX
On the sign
"It will take 3G minutes to walk the Q.4 mile round trip..."
"Dr Durrel retired from the board in 1987 with U7 years of service"
X=Q+U
Sum check G+X =7