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google search
Google search results:
1: https://www.geeksforgeeks.org/pipes-and-cisterns-gq/
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2: https://www.geeksforgeeks.org/pipes-and-cisterns/
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3: https://www.quora.com/A-water-tank-can-be-filled-in-14-hours-by-an-inlet-pipe-and-emptied-in-18-hours-by-an-outlet-pipe-How-long-will-it-take-to-fill-the-tank-if-both-pipes-are-left-open
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4: https://www.toppr.com/ask/en-us/question/a-cistern-has-a-leak-which-would-empty-it-in-8-hours-a-tap/
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5: https://testbook.com/question-answer/an-inlet-pipe-and-an-outlet-pipe-are-taking-to-fil--5ea96c33f60d5d62fd1fbd86
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6: https://government-updates.com/wp-content/uploads/2021/08/15-6.pdf
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7: https://gmatclub.com/forum/two-inlets-pipes-can-individually-fill-a-cistern-in-10-minutes-and-314083.html
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8: https://www.careerbless.com/aptitude/qa/discuss/297_17.php
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9: https://www.pseau.org/outils/ouvrages/acf_gravity_fed_system_2_sizing_en.pdf
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10: https://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Rate-of-work-word-problems.faq.question.329130.html
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