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google search
Google search results:
1: https://www.quora.com/A-boat-sails-15-km-of-a-river-towards-upstream-in-5-hours-How-long-will-it-take-to-cover-the-same-distance-downstream-if-the-speed-of-current-is-one-fourth-the-speed-of-the-boat-in-still-water
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2: https://www.toppr.com/guides/quantitative-aptitude/stream-boat-problems/upstream/
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3: https://www.toppr.com/ask/en-us/question/the-speed-of-a-boat-in-still-water-is-8/
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4: https://www.tutorialspoint.com/quantitative_aptitude/aptitude_boats_streams_examples.htm
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5: https://testbook.com/question-answer/a-boat-sails-15-km-of-a-river-towards-upstream-in--6066a864885323df4bfacce9
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6: https://curioustab.com/discuss/134452/a-boat-sails-15-km-of-a-river-towards-upstream-in-5-hours-how/
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7: https://www.youtube.com/watch?v=nW9WDlcicxE
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8: https://www.hitbullseye.com/Boat-and-Stream-Questions.php
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9: https://askoranswerme.com/27927/
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10: https://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq
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11: https://www.doubtnut.com/question-answer/a-boat-sails-15-km-of-a-river-towards-upstream-in-5-hours-how-long-will-it-takes-to-cover-the-same-d-510425616
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