The coefficients of thermal conductivity of copper, mercury and glass are respectively K_c, K_m a...

The coefficients of thermal conductivity of copper, mercury and glass are respectively K_c, K_m and K_g such that K_cK_mK_g.
If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradients are X_c, X_m and X_g, then
(1) X_c^m=X_mg= X_g
(2) X_cX_mX_g
(3) X_cX_mX_g
(4) X_mX_cX_g
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