The floating platform is supported at each corner by a hollow sealed cylinder 1 m in diameter. The platform itself weights 30kN is air, and each cylinder weighs 1.0kN/meter of length. What total cylinder length L is required for the platform to float 1 m above the water surface? Assum,e that the specific weight of the water is 10,000N/m^3. The platform is square in plan view and has a cylinder in each corner.