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有关初中代数分数和公式的数学题IamaS2student,thefollowingMathsquestionthatIwouldliketoaskforhelp.Thanks1.Intheprocessofdesigningthestructureofastadium,therelationamongthetimeforthecrowd(tminutes),thenu
更新时间:2024-04-25 19:37:23
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有关初中代数分数和公式的数学题

IamaS2student,thefollowingMathsquestionthatIwouldliketoaskforhelp.Thanks

1.Intheprocessofdesigningthestructureofastadium,therelationamongthetimeforthecrowd(tminutes),thenumberofpeopleinthestadium(N),thenumberofpassages(n)andthewidthofeachpassafe(wm)areconsidered,andthefollowingformulaisobtained:

t=3+N/8nw

(a)Itisknownthatattheendofamatch,thereare7200peopleleavingthestadium.If10passagesof6mwideeachareopenedupforpeopletopassthrough,howlongwillittaketoclearallthepeople?

(b)Makenbethesujectoftheformula.

齐世清回答:
  because:T=3+N/8nwN=7200n=10w=6   so:T=3+7200/(8*10*6)=18,ittake18minutestoclearallthepeople
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