Lena and Ras drive to work. Lena drives 24 miles in 1.5 hours. Ras drives 36 km in 1 hour 15 min. Work out the difference between their aver

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Lena and Ras drive to work. Lena drives 24 miles in 1.5 hours. Ras drives 36 km in 1 hour 15 min. Work out the difference between their average speeds in km/h. 1 mile = 1.6 km

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Thành Đạt 6 months 2021-07-29T00:21:21+00:00 1 Answers 38 views 0

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    2021-07-29T00:22:27+00:00

    Answer:

    Difference = 3.2 km/h

    Step-by-step explanation:

    Given that,

    Lena drives 24 miles in 1.5 hours. Ras drives 36 km in 1 hour 15 min.

    For average speed of Lena,

    d = 24 miles = 38.4 km

    t = 1.5 h

    v=\dfrac{38.4}{1.5}=	25.6\ km/h

    For average speed of Ras,

    d = 36 km

    t = 1h 15 min = 1.25 h    

    v=\dfrac{36}{1.25}=28.8\ km/h

    Difference = 28.8-25.6

    = 3.2 km/h

    So, the difference between their average speed is 3.2 km/hr.

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