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A submarine`s depth, in meters below sea level, at a time t minutes after it began to dive below the sea surface is equal to $$g_{(x)}$$ for 0≤t≤6. Its diving speed, measured in meters per minute, is the rate of change in depth.
Quantity A
The average diving speed of the submarine for 0≤t≤3
Quantity B
Quantity B:The average diving speed of the submarine for 3≤t≤6
答案：A