Andy took a bus and then walked from his home to downtown. For the first 16 hour, the bus drove at an average speed of 15 km/h.

Question

Andy took a bus and then walked from his home to downtown.
For the first 16 hour, the bus drove at an average speed of 15
km/h. For the next 0.4 hours, he walked at an average speed
of 4.5 km/h. What was the average speed for the whole
journey?

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Nho 4 years 2021-08-02T04:49:53+00:00 1 Answers 222 views 0

Answers ( )

  1. haidang
    0
    2021-08-02T04:51:15+00:00
    Reply

    Given :

    Speed of bus for first 16 hours is , u = 15 km/h .

    Distance he walked for next 0.4 hour is , v = 4.5 km/h .

    To Find :

    The average speed for the whole  journey.

    Solution :

    Average speed is given by :

    v_{avg}=\dfrac{u_1t_1+u_2t_2}{t_1+t_2}\\\\v_{avg}=\dfrac{15\times 16 + 4.5\times 0.4}{16+0.4}\\\\v_{avg}=14.74\ km/h

    Therefore , the average speed of the journey is 14.74 km/h .

    Hence , this is the required solution .

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