Calculation of true thickness of the bed

1. Scale = focal length/ camera height

2. Excess mass of the body = $255 (g_{max}) (x_{1/2})^2$ tonnes

     $g_{max}$ - maximum gravity anomaly
    
      $x_{1/2}$ is the half-width 

3. Reflection travel time equation:

$t^2={t_0^2+\frac{x^2}{v^2}}$



Note: If any one remember the question please forward, we will discuss. 

Note: This is not the final answer.