A 3000 m long line lying at an elevation of 450 m measures 10 cm on a verticalphotograph.
The focal length of the camera is 21 cm. The scale of the photograph for the area having an elevation of 1000 m will be

1 : 27381
 
1 : 25008
 
1 : 20606
 
1 : 30421
 

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