**Answer:**

**20 mph and 4 mph**

**Step-by-step explanation:**

**GIVEN: **A boat travels upstream for miles in hours and returns in hours traveling downstream in a river.

**TO FIND:** What is the rate of the boat in still water and the rate of the current.

**SOLUTION:**

Let the speed of boat in still water be and speed of current be .

speed of water in upstream

speed of water in downstream

As

Solving both we get

**Hence speed of boat in still water and rate of current is 20mph and 4mph respectively.**