Question 910897
x+y=2,
50*x+30*y=80
x=2-y
50*(2-y)+30*y=80
100-50y+30*y=80
-20*y=-20
y=1
x=2-y
x=1 hour at 50 and  y=1 hour at 30
check
1+1=2
50*x+30*y=80
50*1+30*1=80
50+30=80
80=80
ok