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luisz

  • 2 years ago

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?

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  1. luisz
    • 2 years ago
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    k...

  2. luisz
    • 2 years ago
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    d=100

  3. luisz
    • 2 years ago
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    anything?

  4. luisz
    • 2 years ago
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    ahh

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

  6. luisz
    • 2 years ago
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    derp

  7. luisz
    • 2 years ago
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    C.

  8. luisz
    • 2 years ago
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    no

  9. luisz
    • 2 years ago
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    B.

  10. luisz
    • 2 years ago
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    48

  11. luisz
    • 2 years ago
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    nope

  12. luisz
    • 2 years ago
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    that'swrong

  13. luisz
    • 2 years ago
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    it's 48

  14. satellite73
    • 2 years ago
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    heck no

  15. satellite73
    • 2 years ago
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    oh i mean heck no to 50

  16. satellite73
    • 2 years ago
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    average speed is not the average of the speeds

  17. luisz
    • 2 years ago
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    oh man, you are a guru

  18. luisz
    • 2 years ago
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    you are even higher than DA PANIC!!!!!!

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

  20. satellite73
    • 2 years ago
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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

  21. luisz
    • 2 years ago
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    2.5+1.666666667

  22. luisz
    • 2 years ago
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    divided by 200

  23. luisz
    • 2 years ago
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    equal 48

  24. luisz
    • 2 years ago
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    that it?

  25. luisz
    • 2 years ago
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    200/4.166666667?

  26. luisz
    • 2 years ago
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    =48

  27. luisz
    • 2 years ago
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    100/60=5/3

  28. luisz
    • 2 years ago
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    100/40=2.5

  29. satellite73
    • 2 years ago
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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

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

  31. luisz
    • 2 years ago
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    200 divided by 25/6=48

  32. luisz
    • 2 years ago
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    ty

  33. luisz
    • 2 years ago
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    you nothing about truth tables, guru?

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

  35. luisz
    • 2 years ago
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    by friend, aripotta needs help with them?

  36. satellite73
    • 2 years ago
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    yes, we can do them

  37. satellite73
    • 2 years ago
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    go ahead and post

  38. luisz
    • 2 years ago
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    its not me who needs help with them

  39. luisz
    • 2 years ago
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    its aripotta

  40. luisz
    • 2 years ago
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    I'm posting a different problem

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