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1. |
There are two tank A and B to fill up a water tank. The tank can be filled in 40 min, if both taps are on. The same tank can be filled in 60 min, if tap A alone is on. How much time will tap B alone t |
A. | 64 min |
B. | 80 min |
C. | 96 min |
D. | 120 min |
Answer» E. | |