Quantitative Aptitude Time and Work Pipe and Cistern

Two pipes can fill a tank in 20 hours and 90 hours, respectively. The time (in hours) required to fill the tank when both pipes are opened simultaneously is:

1
\(\frac{177}{13}\)
2
\(\frac{179}{9}\)
3
\(\frac{180}{11}\)
4
\(\frac{183}{8}\)

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