RRB Group D 17-Dec-2018 Shift 1 Soled Paper

Question : 94 of 100

Marks: +1, -0

A pipe A takes 4 hours to fill a tank. Pipe B takes 6 hours to empty the same tank when full. If both the pipes are opened at the same time when the tank is empty, how many hours will it take for the tank to fill?

Validate

Solution:

Time taken to fill the tank by both pipe

={4×6}/{6-4}={4×6}/2=12

hours

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