SOLUTION: the speed of a current is 4 mph. if a boat travels 75 miles down stream in the same time it takes to travel 39 miles up stream, what is the speed of the boat in still water
Algebra ->
Customizable Word Problem Solvers
-> Travel
-> SOLUTION: the speed of a current is 4 mph. if a boat travels 75 miles down stream in the same time it takes to travel 39 miles up stream, what is the speed of the boat in still water
Log On
Question 717717: the speed of a current is 4 mph. if a boat travels 75 miles down stream in the same time it takes to travel 39 miles up stream, what is the speed of the boat in still water Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! the speed of a current is 4 mph. if a boat travels 75 miles down stream in the same time it takes to travel 39 miles up stream, what is the speed of the boat in still water
***
let x=speed of the boat in still water
x+4=speed of the boat downstream
x-4=speed of the boat upstream
travel time=distance/speed
..
75/(x+4)=39/(x-4)
75x-300=39x+156
36x=456
x=12.67 (rounded)
speed of the boat in still water=12.67 mph
(