After sailing 15 miles, a sailor changed direction and increased the boat's speed by 2mph. An additional 19 miles was sailed at the increased speed. The total sailing time was 4 hours. FIND THE RATE OF THE BOAT FOR THE FIRST 15 MILES.
Is this formula correct that I set up?
15/r=19/2r+2=4 hours
I know that the time being the same I can set them equal to one another

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sorry didn't mean to repeat the question

I have my formula corrected in this second one

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