1.

 Three pipes, A, B, & C are attached to a tank. A & B can fill it in 20 & 30 minutes respectively while C can empty it in 15 minutes. If A, B & C are kept open successively for 1 minute each, how soon

A. 180 minutes
B. 167 minutes
C. 200 minutes
D. 178 minutes
Answer» C. 200 minutes


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