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Question Number 122615 by john santu last updated on 18/Nov/20

Commented by liberty last updated on 18/Nov/20

$$\frac{1}{t}=\frac{1}{12}+\frac{1}{15}-\frac{1}{10}=\frac{5+4-6}{60}$$$$\frac{1}{t}=\frac{1}{20}\Rightarrow t=20hours$$

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