The corner points of the feasible region determined

The corner points of the feasible region determined by the following system of linear inequalities: `2x+yge10, x+3yle15,x,yge0` are `(0,0),(5,0),(3,4)` and `(0,5)`. Let `Z=px+qy`, where `p,qge0`. Condition on `p` and `q` so that the maximum of `Z` occurs at both `(3,4)` and `(0,5)` is: (a) `p=q` (b) `p=2q` (c) `p=eq` (d) `q=3p`

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