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19. A family takes a car trip. They travel for an hour at 80 km/h and then for 2 hours at 40 km/h. Find the average speed. (Hint, Remember to consider the total distance and the total amount of time.)

  • Math -

    Do exactly what their hint suggests,

    distance of first part = 1(80) or 80 miles
    distance of 2nd part = 2(4) or 80 miles

    total distance = 160 miles
    total time = 3 hours

    avg speed = 160/3 or 53.33.. miles/hr

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