Answer:
2 1/4 hamburgers per hour
Explanation:
1/3 of an hour equals 20 minutes
r = rate per hour
(20 min ÷ 3/4) = (60 min ÷ r)
cross-multiply to get:
3/4 · 60 = 20r
45 = 20r
r = 45/20 or 9/4 which is 2 1/4
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