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Choose the correct option.
A water tank is two-fifth full.Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes.If both the pipes are open,how long will it take to empty or fill the tank completely?
A6 min.to empty
B6 min.to fill
C9 min.to empty
D9 min.to fill
ENone of these
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