Dimensions of a Twin (single) bed: 39" W x 75" L
Dimensions of two Twin (single) beds placed side by side: 78" W x 75" L
Dimensions of a Queen bed: 60" W x 80" L
So, if you put a queen mattress onto a pair of twin box springs, the mattress will hang over the foot of the bed by 5", and it will be 9" too short on each side (it won't cover the box springs). You'll have to get a queen-sized box springs.
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