Answer
$10Km$
Work Step by Step
We know that
$\theta=2(45.001-45.000)=0.002^{\circ}$
Now $tan\theta=\frac{y}{x}$
This can be rearranged as:
$y=xtan\theta$
We plug in the known values to obtain:
$y=(3.84\times 10^5Km)tan(0.002^{\circ})$
$y=10Km$