一个旅游问题，求问为啥没有可行解

model:sets:time/1..8/:a,c;roads/1..720/;link(time,time):distance;linkr(roads,time):spot,stay;endsetsmax=t;@for(roads(j):a(1)=0;stay(j,1)=0;c(1)=0;@for(time(k)|spot(j,k)#eq#2:@bnd(10,stay(j,spot(j,k)),30));@for(time(k)|spot(j,k)#eq#3:@bnd(20,stay(j,spot(j,k)),60));@for(time(k)|spot(j,k)#eq#4:stay(j,spot(j,k))=30);@for(time(k)|spot(j,k)#eq#5:@bnd(30,stay(j,spot(j,k)),60));@for(time(k)|spot(j,k)#eq#6:@bnd(20,stay(j,spot(j,k)),60));@for(time(k)|spot(j,k)#eq#7:@bnd(30,stay(j,spot(j,k)),60));@for(time(k)|spot(j,k)#eq#8:@bnd(30,stay(j,spot(j,k)),150);@for(time(m)|m#lt#8:c(m)=a(m)+stay(j,spot(j,m));a(m+1)=c(m)+distance(spot(j,m),spot(j,m+1))/v;);@for(time(l)|spot(j,l)#eq#2:a(l)<=230);@for(time(l)|spot(j,l)#eq#4:@abs(30*o-a(l))=0;@gin(o));@bnd(0,o,15);c(8)=330;t=@sum(time(i):stay(j,spot(j,i)))));data:distance=@file(distance.txt);spot=@file(720roads.txt);v=33.33333;enddataend网志问答在浏览839次收到腾讯网的热心用户FancyLeo_342关于琉璃一个旅游问题，求问为啥没有可行解的提问，关于这些疑难问题，进行了深入的分析。得到了网志问答众多网友的支持，得到了如下解决方案，摘录了部分优质回答，如对此有任何好的意见，欢迎大家进行探讨共同解决！

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