Question

since denvers longitude is 105 W and uticas longitude is 75 W, sunrise in denver occurs when

Answer 1

The sun appears to move westward around the Earth
at the rate of 360° every 24 hours =

             (360° / 24 hr)  =  15° per hour.

Denver is  (105°W - 75°W) = 30° west of Utica, so you'd expect
the sun to rise in Denver two hours after it rises in Utica.