Me i don’t know the steps to solve this

x=45

Step-by-step explanation:

2(2x+30)+2(x+15)=360

4x+60+2x+30=360

6x+90=360

6x=360-90

6x=270

x=45

(40+F) * time = 210 miles

( 40 - F) * 2 * time = 380, takes it twice as long to go 380 as 210 down stream

F is the flow and time it time.

solve the first for time = 210/(40+F)  sub into the second

use the quadratic on line solver

flow = 39.9

my equations turned out to be -21F^2 -19F + 32840 = 0

one real root and one negative root, discard the negative root.