To find angle $ \alpha $ use formula:
$$ \sin \left( \alpha \right) = \dfrac{ h }{ a } $$After substituting $ h = 2400 $ and $ a = 600 $ we have:
$$ \sin \left( \alpha \right) = \dfrac{ 2400 }{ 600 } $$ $$ \sin \left( \alpha \right) = 4 $$ $$ \alpha = \arcsin\left( 4 \right) $$$ \arcsin(4) $ is not defined $ \Longrightarrow $ The problem has no solution.