Posted by mandy on .
a motorboat takes 4 hrs to travel 256 miles going upstream. the return trip takes 2 hours going down stream. what is the rate of the boat in still water and what is the rate current.
rate of the boat in still water=mi/hr
rate of the current=mi/hr

math urgent 
Reiny,
rate in still water  x mph
raate of current  y mph
#1: 4(xy) = 256
xy = 64
#2: 2(x+y) = 256
x+y = 128
add them .....
I will let you finish, let me know what you get.
(BTW, the rates seem very unreasonable as you will see) 
math urgent 
Anonymous,
8...? not sure..

math urgent 
Anonymous,
96...? ahah..
still unsure.