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google search
Google search results:
1: https://www.toppr.com/ask/en-us/question/the-speed-of-a-boat-in-still-water-is-8/
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2: https://www.toppr.com/ask/en-us/question/the-speed-of-a-boat-in-still-water-is-15/
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3: https://www.geeksforgeeks.org/trains-boats-and-streams/
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4: http://www.umsl.edu/~defreeseca/intalg/ch8extra/rate.htm
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5: https://www.tutorialspoint.com/quantitative_aptitude/aptitude_boats_streams_examples.htm
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6: https://themathpage.com/Alg/word-problems2-2.htm
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7: https://www.hitbullseye.com/Boat-and-Stream-Questions.php
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8: https://www.scribd.com/document/453808077/Boat-Stream-speed
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9: https://socratic.org/algebra/expressions-equations-and-functions/problem-solving-models
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10: https://gmatclub.com/forum/time-speed-and-distance-simplified-150163.html
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11: https://www.youtube.com/watch?v=nW9WDlcicxE
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