# A boat can travel 8 mph in still water. If it can travel 15 miles downstream in the same time that it can travel 9 miles up the stream, what is the rate of the stream?

##### 1 Answer

#### Explanation:

Let the time of travel in each direction be

Let the velocity of the water be

Let distance be

Given that the boat velocity is 8 mph

Downstream

Upstream

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Write Eqn(1) as:

Write Eqn(2) as:

Using

(This should work no matter which equation you choose)