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22 May, 17:13

A student drove to the university from her home and noted that the odometer reading of her car increased by 12.0 km. The trip took 18.0 min. (a) What was her average speed

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  1. 22 May, 17:35
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    Her average speed was 40 km/h.

    Explanation:

    Hi there!

    The average speed (a. s) is calculated as the traveled distance divided by the time it took to cover that distance:

    a. s = d/t

    Where:

    d = traveled distance.

    t = time.

    In this case, the odometer reading of the car increased by 12.0 km, which means that the distance traveled is 12.0 km. The time it took the student to cover that distance is 18.0 min (18.0 min · 1 h/60 min = 0.3 h). Then the average speed will be:

    a. s = d/t

    a. s = 12.0 km / 0.3 h

    a. s = 40 km/h

    Her average speed was 40 km/h.
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