A) \[9\text{ }hrs\]
B) \[\text{18 }hrs\]
C) \[\text{20 }hrs\]
D) \[\text{20}\frac{1}{2}\text{ }hrs\]
Correct Answer: C
Solution :
Time taken to empty the tank \[=\frac{1}{\frac{1}{4}-\frac{1}{5}}=\]You need to login to perform this action.
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