A boat travels 30km upstream in the same amount if time It takes travel 60km

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A boat travels 30km upstream in the same amount if time It takes travel 60km

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Natalia 2 weeks 2021-10-04T02:24:37+00:00 1 Answer 0 views 0

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    2021-10-04T02:25:53+00:00

    Let the speed of boat be (x-4) in upstream and (x+4) in downstream


    s=d/t ,t= d/s


    30/4= 7.5 hours


    60/4= 15 hours


    then the equation will be


    7.5(x+4)=15(x-4)


    7.5x + 30 +=15x – 60


    +30+60=15x- 7.5x


    90=7.5x


    x=90/7.5


    =12


    answer is 12 kmph.

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