Provide an appropriate response.One pipe can fill a certain tank in 40 minutes. A second pipe can fill the same tank in 30 minutes. How long will it take to fill the tank if both pipes are used? Round to the nearest hundredth minute.
Fill in the blank(s) with the appropriate word(s).
17.14 min
Mathematics
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+ 
A. 
B. 
C. 
D. 
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Mathematics