SOLUTION: Train A leaves at noon going 15 mph and train B leaves at 1 pm going 25 mph. When will they be 315 miles apart?

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Question 367692: Train A leaves at noon going 15 mph and train B leaves at 1 pm going 25 mph. When will they be 315 miles apart?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
15(x + 1) + 25x = 315

Solve the equation for x.