Water rises to a height of 10cm in a capillary tube and mercury falls to a depth of 3.5cm in the same capillary tube. If the density of mercury is 13.6 gm/cc and its angle of contact is 135° and density of water is 1 gm/cc and its angle of contact is 0° , then the ratio of surface tensions of the two liquids is (cos135° = 0.7)