SOLUTION: After sailing 14 mi, a sailor changed direction and increased the boat's speed by 4 mph. An additional 15 mi was sailed at the increased speed. The total sailing time was 3 h. Find

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Question 1124966: After sailing 14 mi, a sailor changed direction and increased the boat's speed by 4 mph. An additional 15 mi was sailed at the increased speed. The total sailing time was 3 h. Find the rate of the boat for the first 14 mi.
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
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After sailing 14 mi, a sailor changed direction and increased the boat's speed by 4 mph. An additional 15 mi was sailed at the increased speed. The total sailing time was 3 h. Find the rate of the boat for the first 14 mi.
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              SPEED        TIME           DISTANCE

First Part       r          14/r            14

Second Part     r+4         15/(r+4)        15

Total                       3

14%2Fr%2B15%2F%28r%2B4%29=3