A boat has a speed of 15 mph in calm water. It takes the boat 3 hours to travel upstream but only 2 hours to travel the same distance downstream. Which equation can be used to find c, the speed of the current?
3 (15 - c) = 2 (15 + c)
2 (15 - c) = 3 (15 + c)
15 - c = 15 + c
15 - 3c = 15 + 2c
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