The time required to fill a tank varies inversely as the square of the diameter of the pipe used. If it takes 4 hr to fill a given tank with a 6-in. pipe, find the diameter of the pipe needed to fill the same tank in 1 hr.
A. 
in.
B. 
in.
C. 
in.
D. 
in.
E. 
in.
Answer: B
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