If a car travels for 20km at 60km/h and then another 30km at 90km/h, what is the average speed of the journey? Round your answer to 2 decim

Question

If a car travels for 20km at 60km/h and then another 30km at 90km/h, what is the average speed of the journey? Round your answer to 2 decimal places.

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Valentina 3 days 2021-10-11T23:42:58+00:00 1 Answer 0

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    2021-10-11T23:44:49+00:00

    Answer:

    75.00 km/h.

    Step-by-step explanation:

    Average speed of the journey = total distance / total time taken.

    The first part of the journey:

    60 = 20/time

    60 * time = 20

    time = 20/60  =

    Second part: 1/3 of an hour.

    90 = 30 / time

    time = 30/90 = 1/3  of an hour.

    So the total distance is 50 km and the total time is 2/3 hours.

    Therefore the average speed

    = distance / time

    = 50 / 2/3

    = 150/2

    = 75.00 km/h.

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