Problem Solved: Detention Time Problem - Wastewater Math

This question comes from the California Wastewater grade 1 certification exam sample questions that can be found here: http://www.swrcb.ca.gov/water_issues/programs/operator_certification/docs/1ques.pdf

The problem reads:
What is the detention time in a stabilization pond if the influent flow rate is 0.785 MGD, the pond depth is 4.5 feet, and the pond covers 17 acres?
a. 97 days.
b. 56 days.
c. 32 days.
d. 14 days.
e. 4.2 days

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Видео Problem Solved: Detention Time Problem - Wastewater Math канала American Water College