Timework7

8There are 2 inlet pipes and an outlet pipe. The efficiency of one of the inlet pipes is double than that of the other. Also, the efficiency of the outlet pipe is half that of the lesser efficient inlet pipe. The empty tank gets filled in 16 hours when all the pipes are opened. How many hours will be taken to fill the empty tank when the 'lesser' efficiency inlet pipe is plugged and the rest kept opened?

Option : B
Explanation :
Let number of hours taken by the outlet and the 2 inlet pipes be 4x, 2x and x respectively.
So in 1 hour the part of empty tank filled is

Hence, inlet pipe with higher efficiency fills the tank in 20 hours.
So in one hour, the desired pipes fill

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