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1. |
A tap can fill a bunker in 4 hours. After half the bunker is filled, three more similar tap are opened. What isthe total time taken to fill the bunker completely? |
A. | 3 hrs |
B. | 5 hrs |
C. | 2.5 hrs |
D. | 4.2 hrs |
Answer» D. 4.2 hrs | |