(75 miles / 3 hours) x (5280 feet / 1 mile) x (1 hour / 60 minutes)
= [ (75 x 5280 x 1) / (3 x 1 x 60) ] (mile-feet-hour/hour-mile-minute)
= (396,000 / 180) feet/minute
= 2,200 feet/minute
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