two trains leave at same time from cities that are 450 miles apart, traveling towards each other. one train travels 20 mph slower. they pass each other after 3 hr. find the rate of each train

Question

This is a question on a homework assignment that I can't figure out. I'm not sure how to set up the equation

Answer 1

Also works if you do 3r + 3(r - 20) = 450

Answer 2

Draw and label a diagram!

3(r) + 3(r + 20) = 450

Can you solve for r and answer