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luisz

In the morning, Alan drove 100 miles at the rate of 60 miles per hour; in the afternoon, he drove another 100 miles at the rate of 40 miles per hour. What was his average rate of speed, in miles per hour, for the day?

  • one year ago
  • one year ago

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  1. luisz
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    k...

    • one year ago
  2. luisz
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    d=100

    • one year ago
  3. luisz
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    anything?

    • one year ago
  4. luisz
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    ahh

    • one year ago
  5. luisz
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    60+40/2=50

    • one year ago
  6. luisz
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    derp

    • one year ago
  7. luisz
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    C.

    • one year ago
  8. luisz
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    no

    • one year ago
  9. luisz
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    B.

    • one year ago
  10. luisz
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    48

    • one year ago
  11. luisz
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    nope

    • one year ago
  12. luisz
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    that'swrong

    • one year ago
  13. luisz
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    it's 48

    • one year ago
  14. satellite73
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    heck no

    • one year ago
  15. satellite73
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    oh i mean heck no to 50

    • one year ago
  16. satellite73
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    average speed is not the average of the speeds

    • one year ago
  17. luisz
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    oh man, you are a guru

    • one year ago
  18. luisz
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    you are even higher than DA PANIC!!!!!!

    • one year ago
  19. Calcmathlete
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    Oh, sorry...just been a while since I've done these...

    • one year ago
  20. satellite73
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    figure out how long it took to get there, then figure out how long it took to get back that is the total time divide the total distance (200 miles ) by the total time to get the average speed

    • one year ago
  21. luisz
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    2.5+1.666666667

    • one year ago
  22. luisz
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    divided by 200

    • one year ago
  23. luisz
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    equal 48

    • one year ago
  24. luisz
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    that it?

    • one year ago
  25. luisz
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    200/4.166666667?

    • one year ago
  26. luisz
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    =48

    • one year ago
  27. luisz
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    100/60=5/3

    • one year ago
  28. luisz
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    100/40=2.5

    • one year ago
  29. satellite73
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    time going it \(\frac{100}{60}\) time returning is \(\frac{100}{40}\) total time is \[\frac{100}{60}+\frac{100}{40}=\frac{25}{6}\] and \[200\div \frac{25}{6}=200\times \frac{6}{25}=8\times 6=48\] as luisz said

    • one year ago
  30. luisz
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    5/2+5/3=15/6+10/6=25/6

    • one year ago
  31. luisz
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    200 divided by 25/6=48

    • one year ago
  32. luisz
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    ty

    • one year ago
  33. luisz
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    you nothing about truth tables, guru?

    • one year ago
  34. satellite73
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    now redo the problem replacing 100 by \(m\) and see that the answer is still 48 mph

    • one year ago
  35. luisz
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    by friend, aripotta needs help with them?

    • one year ago
  36. satellite73
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    yes, we can do them

    • one year ago
  37. satellite73
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    go ahead and post

    • one year ago
  38. luisz
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    its not me who needs help with them

    • one year ago
  39. luisz
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    its aripotta

    • one year ago
  40. luisz
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    I'm posting a different problem

    • one year ago
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