Ardi and Lei are both travelling by train. Ardi’s train travels 70 km in 35 minutes. Lei’s train travels 585 km. It leaves at 9:05 and arriv

Question

Ardi and Lei are both travelling by train. Ardi’s train travels 70 km in 35 minutes. Lei’s train travels 585 km. It leaves at 9:05 and arrives at 13:35. Work out the difference, in km/h, between the average speed of their trains.

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Acacia 4 years 2021-07-29T23:43:55+00:00 1 Answers 16 views 0

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  1. Nem
    0
    2021-07-29T23:45:32+00:00
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    Answer:

    10 km/hr

    Step-by-step explanation:

    Average speed = Total distance travelled / Total time taken

    Ardi:

    Total distance travelled = 70 km

    Total time taken = 35 minutes = 35/60 hour

    Average speed = Total distance travelled / Total time taken

    = 70 km ÷ 35/60 hr

    = 70 × 60/35

    = 4,200/35

    = 120 km/hr

    Lei:

    Total distance travelled = 585 km Total time taken = 9:05 – 13:35 = 4 hours 30 minutes

    = 4.5 hours

    Average speed = Total distance travelled / Total time taken

    = 585 km / 4.5 hours

    = 130 km/hr

    Difference, in km/h, between the average speed of their trains = Lei’s train – Ardi’s train

    = 130 km/hr – 120 km/hr

    = 10 km/hr

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