Why are they calling this "metric" conversions? Acres, inches and gallons are not metric units.
Convert the number of acre-inches to gallons, and divide by 1440 minutes.
This may help:
http://www.bae.ncsu.edu/programs/extension/manure/awm/program/barker/a&pmp&c/conversion.htm
Complete in Metric Conversions:
A drainage system for a 40 acre field is designed to remove 3/8 inch of standing water from the entire field in 24 hours. What flow rate (gpm) must the drainage system achieve to meet the design specification? (283 gpm)
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