3 years ago in Time and Work

Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 20hr. If all pipes are opened simultaneously, then the cistern will be filled in:

[A] 7.5 hr
[B] 8 hr
[C] 8.5 hr
[D] 10 hr
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Godsway Assem
Godsway Assem - 2 months ago

Godsway Assem is saying 10 hr is correct answer

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