It takes 2 hours for a boat to travel 28 miles downstream. The same boat can travel 18 miles upstream in 3 hours. Find the rate of the stream's current.

4 miles per hour.

Step-by-step explanation:

2 hours = 28 miles downstream; 14 miles per hour

3 hours = 18 miles upstream; 6 miles per hour

The boat went faster when going downstream meaning the current is going towards up stream. I would find the average speed, (14+6=20/2=10 m/h average) and determine subtract the average from the speed from wither upstream or downstream. 14 - 10 = 4 and 10 - 6 = 4. Therefore the stream's current is 4 miles per hour.