Same I don’t know , you can go online and pay someone to do it for you
We calculate both velocities:
upstream 8 miles in 2 hours = 4 miles / hour
downstream 8 miles in 1 hour = 8 miles / hour
ps -stream speed = 4 mph
ps + stream speed = 8 mph
Adding both equations
2 ps = 12 mph
paddling speed = 6 mph
stream speed = 2 mph
Just multiply 1/6 it's the scale factor so it'll tell you how you will shrink or enlarge the length
Let x be the unknown number
x×55%=121
x=121÷55%
x=220
So 121 is 55% of 220