SOLUTION: Two buses leave Houston at the the same time and travel in opposite directions, one bus averages 55 mi/h and the other bus averages 45 mi/h. When will they be 400 mi apart?

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Question 326365: Two buses leave Houston at the the same time and travel in opposite directions, one bus averages 55 mi/h and the other bus averages 45 mi/h. When will they be 400 mi apart?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Distance=Rate*Time.
Since they're going in opposite directions, their total distance will be the sum of their individual distances.
D1=55%2At
D2=45%2At
D=55%2At%2B45%2At=400
100t=400
t=4hrs
.
.
.
In 4 hours, they will be 400 miles apart.