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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: https://www.tutorialspoint.com/quantitative_aptitude/aptitude_boats_streams_examples.htm
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5: http://www.umsl.edu/~defreeseca/intalg/ch8extra/rate.htm
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6: https://www.hitbullseye.com/Boat-and-Stream-Questions.php
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7: https://themathpage.com/Alg/word-problems2-2.htm
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8: https://gmatclub.com/forum/time-speed-and-distance-simplified-150163.html
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9: https://books.google.com/books?id=T1k1DwAAQBAJ&pg=PA27&lpg=PA27&dq=The+speed+of+a+boat+in+still+water+is+20+KMPH.+If+it+can+travel+16+KM+upstream+in+1+Hr+What+time+it+would+take+to+travel+the+same+distance+downstream?%0AO+40+minutes%0AO+60+Minutes%0AO+90+minutes%0AO+none%0AO+Clear+Response&source=bl&ots=h9E5mQxoKu&sig=ACfU3U29WmB3hUkuKjFog4r3H9BIyEG0GA&hl=en&sa=X&ved=2ahUKEwjG2PfNzpTzAhUoIDQIHUozCWIQ6AF6BAgYEAM
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10: https://books.google.com/books?id=v8oyEAAAQBAJ&pg=PA29&lpg=PA29&dq=The+speed+of+a+boat+in+still+water+is+20+KMPH.+If+it+can+travel+16+KM+upstream+in+1+Hr+What+time+it+would+take+to+travel+the+same+distance+downstream?%0AO+40+minutes%0AO+60+Minutes%0AO+90+minutes%0AO+none%0AO+Clear+Response&source=bl&ots=bXrD9-_XOn&sig=ACfU3U2BwXIbLUzAy3S0w4ECBmKdruBwCQ&hl=en&sa=X&ved=2ahUKEwjG2PfNzpTzAhUoIDQIHUozCWIQ6AF6BAgXEAM
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