Question 208037
This is a right triangle, so let x = distance of train down the track.
{{{30^2 + x^2 = 50^2}}}
{{{900 + x^2 = 2500}}}
{{{x^2 =1600}}}
{{{x= 40}}} or {{{x=-40}}}


Reject the negative value.


x= 40 meters


R^2