two trains leave los angeles simultaneously traveling on the same track in opposite directions at speeds of 50 and 64 mph. How long will it take before they are 285 miles apart.

It will take 2.5 hours (2 hours and 30 minutes).

This is because 50+64 is 114 (the amount of distance that grows between them every hour)

114*2.5 will equal 285, therefore, the answer is 2.5 hours.