Bunuel wrote:

A certain liquid passes through a drain at a rate of w/20 gallons every x seconds. At that rate, how many minutes will it take y gallons to pass through the drain?

A. y/(1200xy)

B. 20xy/w

C. xy/(3w(

D. w/(3xy)

E. 3y/(wx)

Rate of passing of liquid = w/20 gallons every x seconds = w/(20x) gallons per second

Time taken by y gallons to pass through the drain = y/[w/(20x)] seconds = 20xy/w seconds

in minutes = 20xy/(w*60) = xy/3w

Answer C
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