We add the two times, 2 1/2 hours and 4 1/4 hours, together, and we get 6 3/4. ( 1/2 = 0.50, and 1/4 = 0.25, so 0.50 + 0.25 = 0.75. 0.75 = 3/4).
54 / 6 3/4 = 8.
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