Two trains leave the railroad station at noon. The first train travels along a straight track at 90 mph. The second train travels at 75 mph along another straight track that makes an angle of 130 degrees with the first track.

(I can't figure out how to find the length of the sites with only knowing speeds and not the distances)

I've tried using law of cosine and 90t and 75t as lengths... is this answer correct:

t=2.67 hrs ???