65. It takes 30 minutes to empty a half-full tank by draining it at a constant rate. It is decided to  simultaneously pump water into the half-full tank while draining it. What is the rate at which water  has to be pumped in so that it gets fully filled in 10 minutes?  

(A) 4 times the draining rate 

(B) 3 times the draining rate  

(C) 2.5 times the draining rate 

(D) 2 times the draining rate


Answer-(A) 4 times the draining rate 
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