Question

i needed to edit this

Answer 1

it would be 9mph not 100% ure

Answer 2

let x be the speed of boat, y be the speed of stream
Alicia can row 6 miles downstream in the same time it takes her to row 4 miles upstream.
=> 6/(x+y) = 4(x-y).............equation #1
She rows downstream 3 miles/hour faster than she rows upstream.
=>(x+y)-(x-y) = 3 => y = 1.5................#2
solving, x = 7.5
so,
x+y = 9
x-y = 6
D- 9 mi/h downstream, 6 mi/h upstream

12.
let x be the speed of boat
Every day, his route takes him 22.5 miles against the current and back to his dock, and he needs to make this trip in a total of 9 hours
=> 22.5/(x+6) + 22.5/(x-6) = 9
solving
x = 9 mph

Answer 3

thank you