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    • the speed of boat in still water is 15km/hr it can go 30km upatream and return downstream to origin point in 4hr.30min find the speed of stream
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    the speed of boat in still water is 15km/hr it can go 30km upatream and return downstream to origin point in 4hr.30min find the speed of stream

    pritimaheshwari2017 6th Feb, 2020
    Answer
    Answer (1)
    Mayank Chowdhary 6th Feb, 2020

    Let speed of stream = a km/h

    ∴ Downstream speed = (15+a) kilometre/hour

    ∴ Upstream speed = (15-a)  kilometre/hour

    ∴ 30/(15+a) + 30/(15-a) = 4 1/2

    → 900/225-x² = 9/2

    → 9x² = 225

    → x² = 25

    → x = 5

    ∴ Speed of stream = 5 km/h



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