A tap can empty a tank in one hour. A second tap can empty i

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A tap can empty a tank in one hour. A second tap can empty it in 30 min If both the taps operate simultaneously, how much time is needed to empty the tank ?

[SBI Clerk 28 may2016]

A 20 min

B 30 min

C 40 min

D 45 min

E None of these