Q 2234378252.     A, B, C are three pipes attached to a certain tank, A and B can fill it in 20 minute and 30 minute respectively, while C can empty it in 15 minute. If A, B , C be kept open successively for 1 minute each, how soon will the cistern be filled ?

IBPS-PO 2017 Mock Mains
A

169 minute

B

179 minute

C

189 minute

D

167 minute

E

None of these

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