1002
google search
Google search results:
1: https://www.toppr.com/ask/en-th/question/a-mans-speed-with-the-current-is-15-kmhr-and-the-speed-of-the-current-2/
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2: https://www.toppr.com/ask/en-us/question/in-one-hour-a-boat-goes-11-km-along-the-stream-and-5-km-against/
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3: https://www.examveda.com/a-motorboat-whose-speed-in-15-kmhr-in-still-water-goes-30-km-downstream-and-comes-back-in-a-total-of-4-hours-30-minutes-the-speed-of-the-stream-18852/
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4: https://www.tutorialspoint.com/quantitative_aptitude/aptitude_boats_streams_examples.htm
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5: https://www.examveda.com/the-speed-of-the-boat-in-still-water-is-5-times-that-of-current-it-takes-11-hour-to-row-to-point-b-from-point-a-downstream-the-distance-between-87686/
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6: https://www.geeksforgeeks.org/trains-boats-and-streams/
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7: https://books.google.com/books?id=YQueAAAAQBAJ&pg=SA3-PA68&lpg=SA3-PA68&dq=In+an+hour,+a+man+goes+15+km/hr+along+the+stream+and+3+km/hr+against+the+stream.+The+speed+of+the+man+in+still+water+is:%0AO+3+km/hr%0AO+5+km/hr%0AO+6+km/hr%0AO+None+of+these&source=bl&ots=ZWtWOxvaEw&sig=ACfU3U1p6C9TlbdXp2FV5jZjFpvN14BugQ&hl=en&sa=X&ved=2ahUKEwjl7cTLva3zAhXOJzQIHWjlDQkQ6AF6BAgCEAM
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8: https://www.hitbullseye.com/Boat-and-Stream-Questions.php
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9: https://www.careerbless.com/aptitude/qa/boatsandstreamss1.php
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10: https://www.usgs.gov/natural-hazards/volcano-hazards/pyroclastic-flows-move-fast-and-destroy-everything-their-path
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11: https://books.google.com/books?id=VdrFDwAAQBAJ&pg=PA233&lpg=PA233&dq=In+an+hour,+a+man+goes+15+km/hr+along+the+stream+and+3+km/hr+against+the+stream.+The+speed+of+the+man+in+still+water+is:%0AO+3+km/hr%0AO+5+km/hr%0AO+6+km/hr%0AO+None+of+these&source=bl&ots=Mv_b3Kufc2&sig=ACfU3U1d2GB7eadyaMvBkM-vcOF9AcIYUA&hl=en&sa=X&ved=2ahUKEwjl7cTLva3zAhXOJzQIHWjlDQkQ6AF6BAgTEAM
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