Question 550591
let speed of current be x
speed of boat be y
y-x=14..........(1)

60/(y+x)= 36/(y-x)

60(y-x)=36(y+x)
/12
5(y-x)=3(y+x)
5y-5x=3y+3x
2y-8x=0
/2
y-4x=0..........(2)

multiply (1) by -4
-4y+4x=-56
add this equation to (2)
-3y=-56
y=18.66 mph

y-x=14
18.66-x=14
x=4.66 mph