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Ella walked 4.5 km/h to her friends house. She walked back home from her friends house at 3.5 km/h. She walked a total of 40 minutes. How many minutes was her walk on her way to her friends house?

  • Math -

    (4.5 km/hr x X) + (3.5 km/hr x Y) = 40

    Where X is the time there and Y is your time back.

    X = (40 - 3.5 Y) / 4.5
    = 8.88 - 0.77Y

    Now plug X back into your original eqn and solve for Y:

    4.5 (8.88 - 0.77Y) + 3.5Y = 40

    Got it?

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