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Math help 2 Questions

  1. Oct 3, 2005 #1
    1) A jet took 6h to fly against headwinds of 50 miles/hour from city A to B. It took 5H on the return trip when the winds became tailwinds of 50miles/hour. How fast does the jet travel relative to the air?


    2) The ammount of heat H which passes through wall "t" thick is proportional to the product of the area "A" of a wall T2 - T1, the differnce in temperature of the surfaces of the wall and is inversly proportional to "t". Express the equation and solve for T2.


    For #2 I got to: T2 = ((HT) / A) + T1

    Is that right? thanks.

    Thanks alot guys, been havinga lot of trouble with these.
     
  2. jcsd
  3. Oct 4, 2005 #2
    #1.
    A distance one way is the same as on a way back (AB = BA).
    [distance] = [rate]*[time]
    (x-50)6 = (x+50)5
    x=550.

    #2.
    You got it right! Why doubt?
    Just use "t" instead of "T":
    T2 = Ht / A + T1
     
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