A deep sea diving bell is being lowered at a constant rate. After 12 minutes, the bell is at a depth of 600 ft. After 30 minutes the bell is at a depth of 1900 ft. What is the average rate of lowering per minute? Round to the nearest hundredth as needed.
A. 72.22 ft per minute
B. 43.33 ft per minute
C. 0.01 ft per minute
D. 63.33 ft per minute
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