campus placement HP Test Series Quantitative Aptitude Time and Work Pipe and Cistern

A cistern can be filled with water by a pipe in 8 hours and it can be emptied by the second pipe in 6 hours. If both pipes are opened when the cistern is full, the time in which it would be empty is:

1
18 hours
2
21 hours
3
20 hours
4
24 hours
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