Scale Drawing

What is the scale factor considering that RPQ is the original?
1.5
Original:
10 inches by 5 inches
Scale factor: 4
40 by 20
a scale drawing of a park has dimensions:
Length: 8
Width: 10
the length of the actual park is 400. What is the area of the actual park?
200,000
What would be the length of segment ZX?

20
Original:
9 inches by 4 inches
Scale factor: 1/2
4.5 by 2
a scale drawing of a park has dimensions:
Length: 7
Width: 9
the length of the actual park is 210. What is the area of the actual park?
56,700
what would be the value of 'x'?

4.5
Original:
7 inches by 5 inches
Scale factor: 1.5
10.5 x 7.5
a scale drawing of a park has dimensions:
Length: 4
Width: 7
the length of the actual park is 80. What is the area of the actual park?
11,200