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The depression of mercury in a capillary...

The depression of mercury in a capillary tube of radius `R_(1)` is observed to be equal to the rise of water in another capillary tube of radius `R_(2)`. If the ratio of surface tension of mercury and water is `7.5`, ratio of their density `(p_(Hg))/(p_("water"))=13.6` and their angle of contact are `theta_(Hg)=135^(@)` and `theta_("water")=0^(@)` in the respective tubes then `R_(1)//R_(2)` is :

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