x=luni
x+40=marti
2(x+40)=miercuri ⇔2x+80
2x+80-50=joi⇔2x+30
2x+30=3x
x =30
luni a stat x,adica 30 min
marti a stat 30+40,adica 70 min(o ora si 10 min)
miercuri a stat 2*30+80,adica 40 min ( 2 ore si 20 min)
joi a stat 2*30+40,adica 100 min (o ora si 40 min)
MIERCURI A STAT MAI MULT DE 2 ORE.