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An aerial photograph is taken from a flight at a height of $3.5$ $\text{km}$ above mean sea level, using a camera of focal length $152$ $\text{mm}$. If the average ground elevation is $460 \:m$ above mean sea level, then the scale of the photograph is

  1. $1 : 20000$
  2. $1 : 20$
  3. $1 : 100000$
  4. $1 : 2800$
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