SOLUTION: two trains leave a station at the same time,heading in opposite directions.one train is traveling at 80km/h,the other at 90km/h.how long will it take for the trains to be 425km apa

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Question 133388: two trains leave a station at the same time,heading in opposite directions.one train is traveling at 80km/h,the other at 90km/h.how long will it take for the trains to be 425km apart?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
80X+90X=425
170X=425
X=425/170
X=2.5 HOURS THEY WILL BE 425 HOURS APART.