Problem Solved: Flow Rate 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:
A plastic float is dropped into a wastewater channel and is found to travel 10 feet in 4.2 seconds. The channel is 2.4 feet wide and is flowing 1.8 feet deep. Calculate the flow rate of this wastewater in cubic feet per second.
a. 1.0 ft³/sec.
b. 2.3 ft³/sec.
c. 4.2 ft³/sec.
d. 5.7 ft³/sec.
e. 10.3 ft³/sec

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Видео Problem Solved: Flow Rate Problem - Wastewater Math канала American Water College