<PRE><B>Question 582245</B>
let speed of current be x mph

against current speed = 2-x
with current speed = 2+x

distance = 2miles

time upstream + time down stream = 5

t=d/r

2/(2-x)+ 2/(2+x)=5

LCD = (2+x)(2-x)

multiply by the equation by the LCD

2(2+x)+2(2-x)= 5(4-x^2)
4+2x+4-2x= 20-5x^2

8=20-5x^2
5x^2= 20-8
5x^2=12
x^2= 12/5

x= sqrt(12/5)
x= 1.55 mph speed of current</PRE>