One pipe can empty a tank in 3 hours. A second pipe takes 4 hours to complete the same job. How long will it take to empty the tank if both pipes are used?
One pipe can empty a tank in 3 hours. A second pipe takes 4 hours to complete the same job. How long will it take to empty the tank if both pipes are used?
A. 1 and 5/7 hours | C. 2 and 1/4 hours |
B. 1 and 3/4 hours | D. 2 and 3/4 hours |
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