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1. |
A tank is emptied everyday at a fixed time point. Immediately thereafter, either pump A or pump B or both start working until the tank is full. On Monday, A alone completed filling the tank at 8 pm. On Tuesday, B alone completed filling the tank at 6 pm. On Wednesday, A alone worked till 5 pm, and then B worked alone from 5 pm to 7 pm, to fill the tank. At what time was the tank filled on Thursday if both pumps were used simultaneously all along? |
A. | 4 : 36 pm |
B. | 4 : 24 pm |
C. | 4 : 12 pm |
D. | 4 : 48 pm |
Answer» C. 4 : 12 pm | |