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google search
Google search results:
1: https://www.toppr.com/ask/en-us/question/a-man-rows-downstream-30-km-and-upstream-18-km-taking-5-hours-each-time/
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2: https://www.toppr.com/ask/question/ritu-can-row-downstream-20-km-in-2-hours-and-upstream-4-km-in-2/
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3: https://www.tutorialspoint.com/quantitative_aptitude/aptitude_boats_streams_examples.htm
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4: https://www.quora.com/A-man-swims-12-km-downstream-and-10-km-upstream-If-he-takes-2-hours-each-time-what-is-the-speed-of-the-stream
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5: https://testbook.com/question-answer/arjun-takes-5-hrs-to-swim-upstream-of-40-km-where--5f19a414833caa0d0cc6c292
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6: https://iim-cat-questions-answers.2iim.com/quant/arithmetic/speed-time-races/
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7: https://www.openalgebra.com/2012/11/applications-of-rational-equations.html
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8: http://cbseacademic.nic.in/web_material/QuestionBank/ClassX/MathsX.pdf
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9: https://icanclasses.com/wp-content/uploads/2021/06/time-speed-Q-A.pdf
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10: https://mailuread.files.wordpress.com/2016/08/ch-time-speed-and-distance_exercise.pdf
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11: https://www.scribd.com/document/420232331/Cat-aptitude
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