Calculate the average speed of a complete round trip in which the outgoing 220 kmkm is covered at 92 km/hkm/h , followed by a 1.0-hh lunch b

Question

Calculate the average speed of a complete round trip in which the outgoing 220 kmkm is covered at 92 km/hkm/h , followed by a 1.0-hh lunch break, and the return 220 kmkm is covered at 55 km/hkm/h . Express your answer to two significant figures and include the appropriate units.

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Maris 6 months 2021-07-25T03:20:40+00:00 1 Answers 11 views 0

Answers ( )

  1. Dulcie
    0
    2021-07-25T03:22:16+00:00
    Reply

    Answer:

    60 km/hr

    Explanation:

    220 km is covered at 92km/hr in the round trip

    There is 1 hour lunch break

    During the return of the round trip 220 km is covered at 55km/hr

    The first step is to calculate the total distance

    = 220km + 220km

    = 440km

    The time spent during the entire round trip can be calculated as follows

    = (220/92) + 1 + (220/55)

    = 2.3913 + 1 + 4

    = 7.3913

    Therefore the average speed can be calculated as follows

    = distance/ time

    = 440/7.3913

    = 59.52

    = 60km/hr (approximated to 2 significant figures)

    Hence the average speed is 60 km/hr

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