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.