Chords, Secants, and Tangents

Sometimes when the moon orbits Earth, it moves between the sun and Earth. When this happens, the moon blocks the light of the sun from reaching Earth. This causes an eclipse of the sun, or solar eclipse. During a solar eclipse, the moon casts a shadow onto Earth. $$\\$$ Assume $AB=150km$, $AC=140km$, $y=25km$ $$\\$$ Using the intersecting secants theorem, find $x$. $$\\$$ In millions of kilometers