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satellite73

A wagon train that is one mile long travels one mile at a constant rate. During the same time period, a horse rides at a constant rate from the front of the wagon train to the rear, and then back to the front. How far did the horse ride?

  • one year ago
  • one year ago

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  1. Zarkon
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    do you have a solution or are you actually looking for a solution?

    • one year ago
  2. satellite73
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    i spent an hour on it this morning, and yes i have a solution you can google it and get one, but honestly i did not understand the yahoo answer, so i redid it differently thought it was kind of cute because it made me think

    • one year ago
  3. Zarkon
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    I just found the time it takes to get to the back and then the time it takes to get back to the front. then \[d=v_1\cdot t_1+v_2\cdot t_2\]

    • one year ago
  4. satellite73
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    ok maybe half an hour, but still

    • one year ago
  5. Zarkon
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    though \[v_1=v_2=h\] h=speed of the horse

    • one year ago
  6. beginnersmind
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    I think I got the logic, but can't do the algebra :(

    • one year ago
  7. Zarkon
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    well if you have an answer...tell me if I got it right... \[\frac{2h^2}{(w+h)(h-w)}\] where h = speed of horse and w= speed of wagon

    • one year ago
  8. satellite73
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    the answer is an actual number

    • one year ago
  9. beginnersmind
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    I think you can get a specific answer without knowing the actual speed

    • one year ago
  10. Zarkon
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    that seems weird to me...unless I am not understanding the question

    • one year ago
  11. FoolAroundMath
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    the answer should be 3 miles. Looking for a way to explain that other than intuition

    • one year ago
  12. satellite73
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    no it is not three, although i did get three the first time

    • one year ago
  13. Zarkon
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    what if the horse moves at the same rate as the wagon?

    • one year ago
  14. FoolAroundMath
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    oops ... its 2miles .. i'll draw a figure.. hopefully that'll help

    • one year ago
  15. Zarkon
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    does the wagon stop after 1 mile?

    • one year ago
  16. satellite73
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    don't forget that the horse travels front to back and back to front at the same time the train goes one mile

    • one year ago
  17. satellite73
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    so it cannot travel at the same rate as the train

    • one year ago
  18. Zarkon
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    oh ... ok...well that is different

    • one year ago
  19. beginnersmind
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    If w is the speed of the wagon and h is the speed of the horse it takes t=1/w time for the wagon to travel one mile. The horse takes 1/(h+w) time to get from the start to the end and 1(h-w) to get from the end to the front. So we get 1/h = 1/(h+w)+1/(h/w). This should be solved for h/w

    • one year ago
  20. satellite73
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    in fact that was the key to the solution, i picked 1 for the speed of the train, then solved for the speed of te horse

    • one year ago
  21. FoolAroundMath
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    |dw:1341539647363:dw| The train moves 1 mile. The initial position of the train (left rectangle) and initial position of the horse (rear of the train = extreme left) are shown. After the train has moved 1 mile, the train's new position is drawn (The right rectangle). and the final position of the horse is shown (front of the train = extreme right). Now its easy to see that the horse traveled 1+1 = 2miles

    • one year ago
  22. satellite73
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    @beginnersmind left hand side maybe \(\frac{1}{w}\)?

    • one year ago
  23. FoolAroundMath
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    edit: messed up my right's from left's.

    • one year ago
  24. satellite73
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    @FoolAroundMath not 2

    • one year ago
  25. beginnersmind
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    @satellite Yeah. Got it, I think. Couldn't have done it without setting w to 1 though.

    • one year ago
  26. FoolAroundMath
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    Talk about half-reading questions. I completely missed that "then back to the front" part. and it can be done without taking the speed of the wagon to be 1. \[\frac{1}{w} = \frac{1}{h+w} + \frac{1}{h-w}\]\[\frac{1}{w} = \frac{2h}{h^{2}-w^{2}}\]\[h^{2}-w^{2} = 2hw\]Dividing by \(w^{2}\)on both sides of this equation \[(\frac{h}{w})^{2} - 1 = 2\frac{h}{w}\]\[t^{2}-2t-1 = 0\]\[t = \frac{2 \pm \sqrt{4-(-4)}}{2}\]\[t = 1 \pm \sqrt{2} \Rightarrow t = 1+\sqrt{2}\]We need distance traveled by horse = h*(1/w) = h/w = \(1+\sqrt{2}\)

    • one year ago
  27. satellite73
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    yeah that is what i got but slightly different method i put \(w=1\) speed of the horse as \(h\) and solved for \(h\) reasoning as follows: speed going back is \(1+h\) time is \(\frac{1}{1+h}\) leaving \(1-\frac{1}{1+h}\) time for the horse to make it one mile to the front at a rate of \(h-1\) and so solved \(1=(h-1)(1-\frac{1}{h+1})\) since the time is one the rate is the distance more than one way to skin a cat i guess

    • one year ago
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