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marihelenh

  • one year ago

A motorist drives 150 km from one city to another in 2.5 h but makes the return trip ikn only 2.0 h. What are the average speeds for (a) each half of the round trip and (b) the total trip.

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  1. marihelenh
    • one year ago
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    @triciaal @amistre64

  2. amistre64
    • one year ago
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    what is your concept of an average speed?

  3. marihelenh
    • one year ago
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    What do you mean? I tried the problem and I got some answers, could you see if I am on the right path with this problem?

  4. amistre64
    • one year ago
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    solutions start with knowing what it is you are looking for ... in this case, it wants an average speed.

  5. triciaal
    • one year ago
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    distance between the cities stays the same

  6. amistre64
    • one year ago
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    we need to make sure we have a proper definition of average speed to get started

  7. marihelenh
    • one year ago
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    s=d/t

  8. amistre64
    • one year ago
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    more accurately I would say average speed = (distance covered)/(time it took)

  9. amistre64
    • one year ago
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    s (or speed) is an instantaneous measurement ...

  10. marihelenh
    • one year ago
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    |dw:1440972635400:dw|

  11. amistre64
    • one year ago
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    those are fine for part a, assuming the mathing is correct, structure is fine

  12. marihelenh
    • one year ago
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    For part (b) then, could I do, \[\frac{ 150km +150km }{ 2.5h +2.0h }=\frac{ 300km }{ 4.5h }=66.6km/h=67km/h\]

  13. amistre64
    • one year ago
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    you did fine

  14. marihelenh
    • one year ago
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    That's reassuring. Thank you. Can you see if you can help me with another? I am not quite sure how to do it. I kind of get one part, but don't understand it completely.

  15. amistre64
    • one year ago
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    i can put an eye to it ... then i might be able to determine how useful i can be

  16. marihelenh
    • one year ago
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    Ok, well just give me a minute.

  17. amistre64
    • one year ago
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    k

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