With the current, you can canoe 12 miles in 3 hours. Against the same current, you can canoe only half of this distance in 6 hours. For the following problems, use $x$ for the rate you canoe in still water and $y$ for the rate of the current.

a) Write a mathematical expression for the distance you can canoe with the current.
Answer:

b) Write a mathematical expression for the distance you can canoe against the current.
Answer:

c) What is the rate of the current? (Note: The rate is measured in miles per hour: mph )
Answer: