If the volume of an estuary is 2.1 km3, and the net flow rate of mixed surface water out of the estuary is 7.5 million m3 per day, the flushing time of the estuary is ________.
A. 3.5 days
B. 1 day
C. 350 days
D. 35 days
E. 280 days
Answer: E
Environmental & Atmospheric Sciences
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