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1. |
Two faucet A and Bcan fill a cistern in 6 hours and 2 hours respectively. If they are opened on alternatehours and if faucet A is opened first, in how many hours will the cistern be full? |
A. | 4 hrs |
B. | 5 hrs |
C. | 6 hrs |
D. | 7 hrs |
E. | |
Answer» B. 5 hrs | |