What is the average access time for a drum rotating at 4000 revolution

1.	What is the average access time for a drum rotating at 4000 revolutions per minute?
A.	2.5 milli seconds
B.	5.0 milli seconds
C.	7.5 milli seconds
D.	4.0 milli seconds
Answer» D. 4.0 milli seconds

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What is the average access time for a drum rotating at 4000 revolutions per minute?

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