Answer:
The rate of the boat in still water is;

The rate of the current is;

Step-by-step explanation:
Let x represent the rate of the boat in still water, and y represent the rate of the current;
Speed upstream is;

Speed downstream is;

Recall that distance equals the product of speed and time;
Upstream the product is;

Downstream;

Expand both equation and multiply equation 2 through by 2;

solve the simultaneous equation by elimination; add equation 1a and 2a together;

Then we can substitute x into equation equation 2 to get y;

Therefore, the rate of the boat in still water is;

The rate of the current is;
