A $2\mathrm{.}0$cm$2\mathrm{.}0$cm$6\mathrm{.}0$cm$2\mathrm{.}0$cm$2\mathrm{.}0$cm$6\mathrm{.}0$cm block floats in water with its long axis vertical. The length of the block above water is $3\mathrm{.}0$ cmcm$.$