Question 866408
This lesson might help very much:

<a href="http://www.algebra.com/tutors/Uniform-Rates-Travel%3A-Two-Speeds-Differ-by-Constant-Same-Distance.lesson?content_action=show_dev">Uniform Rates, Travel: Two Speeds Differ by Constant, Same Distance </a>
http://www.algebra.com/tutors/Uniform-Rates-Travel%3A-Two-Speeds-Differ-by-Constant-Same-Distance.lesson?content_action=show_dev