two cars 270 mi. apart enter an interstate highway traveling towards one another. one car travels at 65 mph and the other at 55 mph. when will they meet

Answer 1

no idea. when did they start?

However, if you want to know how long it took them to meet, that would be
time = distance/speed = 270/(65+55) = ? hours

Answer 2

r1*t + r2*t = 270.
65*t + 55*t = 270,
t = ?