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PHYSICS

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A girl rows 10 km downstream in 2 h. Her return trip takes 3 h. How fast is the current. in km/

  • PHYSICS - ,

    v = her speed
    c = current speed
    (v+c) * 2 = 10
    (v-c) * 3 = 10

    v + c = 5 = 15/3
    v - c = 10/3
    --------------subtract
    2 c = 5/3
    c = 5/6

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