A car travels the first 19 km of its journey at an average speed of 57km/h and the remaining 55 km at an average of 110 km/h. Find the avera

Question

A car travels the first 19 km of its journey at an average speed of 57km/h and the remaining 55 km at an average of 110 km/h. Find the average speed of the car for it’s entire journey.

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Amaya 2 weeks 2021-09-10T20:55:15+00:00 2 Answers 0 views 0

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    0
    2021-09-10T20:56:16+00:00

    Answer:

    55m/h

    Step-by-step explanation:

    At 57km/h, to drive 19km takes 19/57 = 1/3 hour (or 20 minutes).

    At 110km/h, to drive 55km takes 55/110 = 1/2 hour (or 30 minutes).

    Since it takes 5/6 hour (or 50 minutes) to drive the 19+55 = 74 km,

    the average speed is: 74 / (5/6) = 74 * (6/5) = 88.8 km /h.

    Alternatively: 74 km / 50 minutes = 1.48 km/minute

    = 1.48 km/minute * 60 minutes/ 1 hour = 1.48 * 60 km/h = 88.8 km /h

    = 1.48 km/minute * 1 minute / 60 seconds = 24.6666… m/s

    = 55 m/h.

    Hope it helps:)

    Please mark as brainliest.

    0
    2021-09-10T20:57:04+00:00

    Answer:

    55m/h

    Step-by-step explanation:

    At 57km/h, to drive 19km takes 19/57 = 1/3 hour (or 20 minutes).

    At 110km/h, to drive 55km takes 55/110 = 1/2 hour (or 30 minutes).

    Since it takes 5/6 hour (or 50 minutes) to drive the 19+55 = 74 km,

    the average speed is: 74 / (5/6) = 74 * (6/5) = 88.8 km /h.

    Alternatively: 74 km / 50 minutes = 1.48 km/minute

    = 1.48 km/minute * 60 minutes/ 1 hour = 1.48 * 60 km/h = 88.8 km /h

    = 1.48 km/minute * 1 minute / 60 seconds = 24.6666… m/s

    ~= 55 m/h

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