Given:\\\\(T_b-T_f=100\\\\)Temperature of liquid, \\\\(T=\\dfrac{2}{5}\\\\) distance between lower and upper fixed pointTemperature of liquid, \\\\(T=\\dfrac{2}{5}\ imes 100=40^0C\\\\)On kelvin scale, \\\\(T_k=273.15+40\\\\) \\\\(T_k=313.15K\\\\)The correct option is B.