Asailboat travels a distance of 2 1/2 miles in 1/6 of an hour. which complex fraction represents the unit rate in miles per hour?

Rewrite "2 1/2 miles" as the improper fraction (5/2) miles.
Divide this by (1/6) hour:

5
--
2

(miles/hour)
1
--
6

To divide by the fraction 1/6, invert it and multiply.  We get 

5                  6
-- (miles) * = (30/2) mph = 15 mph
2                  1 hour

$22. if larry's profit were to minimize by one for every hour his store were to be closed, we would subtract 30 by 8.

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