Provide an appropriate response. One pump can drain a pool in 9 minutes. When a second pump is also used, the pool only takes 5 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
A. 11
min
B. 41 min
C. 
min
D. 3
min
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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