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anonymous

  • 5 years ago

Randy is driving 4 miles per hour faster than Sandy and if they are 287 miles apart after 3.5 hours then how fast is Sandy driving?

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  1. amistre64
    • 5 years ago
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    287/4 should get you randys starting point

  2. amistre64
    • 5 years ago
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    287/3.5

  3. anonymous
    • 5 years ago
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    i set it up as 287=3.5S + 3.5R R=S+4 (R being randys speed, S being sandys speed)

  4. amistre64
    • 5 years ago
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    speed randy (time) + speed sandy (time) = 287

  5. amistre64
    • 5 years ago
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    good good

  6. anonymous
    • 5 years ago
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    and i got 39 for S but thats not one of my options

  7. anonymous
    • 5 years ago
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    idk what i did wrong

  8. amistre64
    • 5 years ago
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    287 = (s+4)(3.5) + 3.5s 287 = 3.5s +3.5s + 14 287-14 = 7s 273 = 7s 273/7 = s 39 = s

  9. amistre64
    • 5 years ago
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    maybe its a bad model :)

  10. amistre64
    • 5 years ago
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    randy would be going 43 and sandy 39 right?

  11. anonymous
    • 5 years ago
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    thats what i figured

  12. amistre64
    • 5 years ago
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    maybe it changes if they are starting from the same spot

  13. anonymous
    • 5 years ago
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    my options are 51 56 61 66 71

  14. amistre64
    • 5 years ago
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    randy - Sally = 287

  15. amistre64
    • 5 years ago
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    (3.5s + 14) - (3.5s) = 287 ?

  16. anonymous
    • 5 years ago
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    its 39! :(

  17. anonymous
    • 5 years ago
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    actually i got 0 when i did it again

  18. amistre64
    • 5 years ago
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    lol try randy-287 = sally

  19. amistre64
    • 5 years ago
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    nope

  20. anonymous
    • 5 years ago
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    GAHHHH my teacher sucks

  21. amistre64
    • 5 years ago
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    distance = speed (time) right?

  22. anonymous
    • 5 years ago
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    yes btw the last question you helped me with..the pools..i was looking at the wrong answer options..it wasnt 61

  23. amistre64
    • 5 years ago
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    ohhhh...was that the one with 7.1 radius

  24. anonymous
    • 5 years ago
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    yes im just gonna yell at my teacher and tell him he gave me a faulty question

  25. amistre64
    • 5 years ago
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    I get: Dr = Ds + 287 but dunno if its gonna work :)

  26. amistre64
    • 5 years ago
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    (s+4)(3.5) = s(3.5) + 287

  27. anonymous
    • 5 years ago
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    got 0

  28. amistre64
    • 5 years ago
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    if they start at different points and travel towards each other, but thats not in the question

  29. anonymous
    • 5 years ago
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    right they are from the same point and driving away from each other

  30. amistre64
    • 5 years ago
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    away from each other?

  31. anonymous
    • 5 years ago
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    yeah

  32. amistre64
    • 5 years ago
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    thenDr + Ds = 287 if thats the case 7s +14 = 287 7(s+2) = 287 i still get 39

  33. anonymous
    • 5 years ago
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    :(

  34. anonymous
    • 5 years ago
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    this class is ridiculous these are like impossible problems and i still have a whole other set of problems to start

  35. amistre64
    • 5 years ago
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    if sally is not moving, does that change the dynamics of our problem?

  36. anonymous
    • 5 years ago
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    yeah cuz then she would have no speed

  37. anonymous
    • 5 years ago
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    and therefore would have no distance

  38. amistre64
    • 5 years ago
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    think of it like this maybe....in one hour, randy if 4 miles farther.....

  39. amistre64
    • 5 years ago
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    randy, at the end of 3.5 hours is 14 miles farther than sally

  40. anonymous
    • 5 years ago
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    that wouldnt change the equation for sally's speed though..

  41. amistre64
    • 5 years ago
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    they have traveled a distance of 273 miles if they were traveling the same speed right?

  42. anonymous
    • 5 years ago
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    no because when we substitute R in for S+4 they arent

  43. anonymous
    • 5 years ago
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    and the question says they are travleing different speeds

  44. amistre64
    • 5 years ago
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    randy is 14 miles further than sally at 3.5 hours right?

  45. anonymous
    • 5 years ago
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    yeah

  46. amistre64
    • 5 years ago
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    so 287 - 14 = the distance traveled by Sally in 3.5 hours right? 273 in 3.5 hours?

  47. amistre64
    • 5 years ago
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    speed equals distance/time

  48. amistre64
    • 5 years ago
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    that gives me 78 mph..... but its closer :)

  49. anonymous
    • 5 years ago
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    hahah and still not an option

  50. anonymous
    • 5 years ago
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    I am giving up for tonight, thank you for all your help

  51. anonymous
    • 5 years ago
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    :)

  52. amistre64
    • 5 years ago
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    Gnite :)

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