Two pipes are used to fill a water storage tank. The first pipe can fill the tank in 8 hours, and the two pipes together can fill the tank in 4 hours less time than the second pipe alone. How long would it take for the second pipe to fill the tank?
?
A. 8 hours
B. 16 hours
C. 12 hours
D. 15 hours
E. 4 hours
Answer: A
Mathematics
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