There are a total of 1000 spaces - 320 spaces = <<1000-320=680>>680 spaces in both sections 2 and 3.
Let the number of spaces in section 3 be x. The number of spaces in section 2 = x + 200.
We know that 320 + x + 200 + x = 1000.
Combining like terms, we get 2x = 480
Dividing both sides by 2 produces x = 240.
The number of spaces in section 2 is 240 + 200 = <<240+200=440>>440.
#### 440