Algebra Practice Quiz 9

Multiple Choice Questions. Click on the correct answer.

Problem 14

14. A water tank can be filled by one pipe in 10 hours and it can be emptied by another in 15 hours. If both pipes are open, how long will it take to fill tex2html_wrap_inline24 the tank?
    30 hours.
    15 hours.
    60 hours.
    45 hours.
    none of these.

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