Verified answer

0.6=2*pi*x*sqrt(600/y) Divide by 2*pi*x

0.6/(2pix)=sqrt(600/y) Raise each side to the power of 2

(0.6/(2pix))^2=600/y Multiply by y.

y*(0.6/(2pix))^2=600 Divide by (0.6/(2pix))^2

y=600/((0.6/(2pix))^2)

That's y in terms of x. An exact value for y cannot be found as no exact value for x is given.

EDIT: LOL. Okay, it's the same answer, except without the x... so 600/((0.6/(2pi))^2)=65797.36 ish

Square both sides to get rid of the radical.

(3/5)^2 = (2)^2 * (pi)^2 * radical(600/y)^2

9/25 = 4 * pi^2 * 600 / y

9y/25 = 4 * 600 * pi^2

9y = 4 * 600 * 25 * pi^2

9y = 100 * 600 * pi^2

9y = 60000 * pi^2

y = 60000/9 * pi^2

y = (20000 * pi^2)/3 = 6666.67 * pi^2 = approx 65797.3662