17/18 is the right answer hope it helps
X - speed of the current
40+x - speed with current
40-x - speed against current
t-time
(40+x)*t=100
(40-x)*t=60
40t+xt=100
<span> + 40t-xt = 60
</span> 80t =160
t = 2
40t+xt=100,
40*2+2x=100
80+2x=100
2x=100-80
2x=20
x=10 mi/h
10 mi/h speed of the current.
WHATTTTTTTTTTTTTTTTTTTTTTTTTTT
The answer is 70 hope this helps
I believe the answer is <span>C. 5/1000=0.00005</span>