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M: +1.00/-0.00

In the bottom of a water tank, there are two drains A and B. If only A is open, it takes 30 minutes to empty a full tank and if only B is open, it takes 20 minutes. If for 10 minutes both drains are open, then B is closed, how much time it takes to empty a full tank?

[BPSC 2016 ,2017 (60-62)th]
A
B
C
D
E
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