Uniform Motion

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A certain fish requires 3 hrs to swim 15km downstream. The return trip upstream takes 5 hrs. What is the speed of the fish still in water? How fast is the current of the stream?

  • Uniform Motion -

    downstream = 15/3 = 5 km/hr
    upstream = 15/5 = 3 km/hr
    so
    v+c = 5
    v-c = 3
    ---------- subtract
    0 +2c = 2
    c = 1 km/hr

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