Simply (a8a6)^(1/7)/a2
1 answer:
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Call the surface 
; then the area of is given by the surface integral
Parameterize the surface by
with
and 
. The surface element is given by
So the area is
where
Parameterize the surface by
with
So the area is
where
If you want to keep it technical, the normal “/unit rate” for running is minutes per mile. You can use dimensional analysis like I did below to find the answer. You should get 11.45 min/mile or about 11 min 25 sec per mile
