6. A hemispherical bowl B1 and a hollow right circular cylinder B2 (having length equal to its radius) have the same diameter equal to the length of a side of a hollow cubical box B3. Water is filled in all these vessels up to the same level and such that hen-dspherical bowl is full of water and the volumes of filled water are V1, V2 and V3, respectively, in B1, B2 and B3, then: