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google search
Google search results:
1: https://www.quora.com/If-a-train-180m-long-is-running-with-a-speed-of-45kmph-and-it-passes-through-a-540m-long-tunnel-how-much-time-will-it-take
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2: https://www.toppr.com/guides/quantitative-aptitude/time-and-speed/train-problems/
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3: https://www.toppr.com/ask/en-us/question/two-trains-running-in-opposite-directions-cross-a-man-standing-on-the-platform-in-27-2/
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4: https://gmatclub.com/forum/time-speed-and-distance-simplified-150163.html
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5: https://www.careerbless.com/aptitude/qa/pot1.php
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6: https://www.indiabix.com/aptitude/problems-on-trains/discussion-458
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7: https://www.hitbullseye.com/Problems-on-Trains.php
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8: https://www.math-only-math.com/two-trains-passes-in-the-opposite-direction.html
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9: https://www.khanacademy.org/test-prep/mcat/physical-processes/speed-and-velocity/v/calculating-average-speed-and-velocity-edited
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10: https://courses.lumenlearning.com/physics/chapter/7-7-power/
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11: https://testbook.com/question-answer/a-train-passes-a-station-platform-in-36-seconds-an--607a7e9cf572a5f4682b0bc1
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