word problem

Question

Two buses leave Houston at the same time and travel in opposite directions. One bus averages 55 mi/h and the other bus averages 45 mi/h. When will the buses be two miles apart?

Answer 1

Let t = the amount of time when the buses will be two miles apart

55t + 45t = 2

       100t = 2

             t = 1/50 of an hour