March 29, 2017

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The speed of a boat in still water is 8 km/h. It travels 60 km upstream and 60 km downstream in a total time of 16 hours. What is the speed of the stream?

  • math - ,

    Let the speed of the stream be x km/h

    Time to go upstream = 60/(8-x)
    time to go downstream = 60/(8+x)

    so 60/(8-x) + 60/(8+x) = 16

    multiply both sides by (8-x)(8+x), simplify and solve the resulting quadratic equation.

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