Quantitative Aptitude Time and Work Pipe and Cistern

Pipe A can fill a tank in 10 hours, pipe B in 20 hours and pipe C in 60 hours. If all the pipes are opened simultaneously, in how many hours will the tank be filled?

1

\(1 \frac{3}{4}\) hours

2

\(7 \frac{1}{3}\) hours

3

6 hours

4

3 hours

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