1.

Two pipes A and B can fill a tank in 16 hours and 20 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?

A. \[8\frac{8}{5}\]hours
B. \[8\frac{8}{9}\] hours
C. \[8\frac{17}{9}\]hours
D. \[8\frac{7}{9}\]hours
Answer» C. \[8\frac{17}{9}\]hours


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