Answer: 2640 ft/min
Explanation:
Observe this as a fraction 30 min/ 1 hr
First Convert miles to ft
1 mile = 5280 ft
so 30 miles * (5280ft/1 mile) = 30 * 5280 ft (Note miles unit cancels) = 158,400 ft
Then convert hours to minutes
1 hr = 60 min
158400 ft/1 hr * (1 hr/60 min) = 158400ft / 60 min (hr unit cancels) = 2640 ft/ min