Quantitative Aptitude Time and Work Pipe and Cistern

Pipe P can fill a tank 8 hours and Pipe Q can fill it in 10 hours. If they are opened an alternate hour and if pipe P is opened first, then in how many hours the tank should be full?

1

8.8 hours

2

6.3 hours

3

7.5 hours

4

3.6 hours

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