Recall your d = rt.
so hmm is about the same as the other one... so say the boat has a speed rate of "b", well, going downstream the boat goes say " b + 2 ", because the current is adding to it, and going upstream is " b - 2 " because the current is eroding from it.
So if the whole trip took 14 hours, say it took "t" hours going upstream, then going downstream it took the slack or " 14 - t ".
Also notice, the trip forth and back is the same 45 miles.

The solution to x + 8.5 = 64.5 is 56.
x + 8.5 = 64.5
- 8.5 - 8.5
---------------------------
x = 56
Answer:
t = 1
Step-by-step explanation:
16 - 2t = 5t + 9
+2t +2t
-------------------------
16 = 7t + 9
-9 -9
--------------------------
7 = 7t
/7 /7
--------------------------
1 = t