Please Help Really stuck

4 2/3 mph

Step-by-step explanation:

A boat travels 15 miles upstream and 19 miles downstream.

If the boat travels 8 mph in still water, find the speed of the current if the total trip takes 6 hours.

Let c = the speed of the current

then

(8+c) = effective speed downstream

and

(8-c) = effective speed upstream

Write a time equation: time = dist/speed

Upstream time + downstream time = 6 hrs

120+15c+152-19c=384-6c²

6c²-4c-112=0

c=4 2/3

3.9

√15=3.87298334... so rounded to the tenth is 3.9