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1. |
Raghu's tanker can fill a cistern in 4 hours. After half the cistern is filled, three more similar tankers are opened. What is the total time taken to fillthe cistern completely? |
A. | 2h 30 min |
B. | 2h |
C. | 3h |
D. | 2h 40 min |
Answer» B. 2h | |