A triple$-$effect evaporator concentrates a liquid with no appreciable elevation of boiling point. If the temperature of the steam to the first effect is $395K,$ and vacuum is applied to the third effect so that the boiling point is $325K,$ what are the approximate boiling points in the three effects? The overall heat transfer coefficients may be taken as $3\mathrm{.}1,2\mathrm{.}3,1\mathrm{.}3k\frac{W}{m^2}.K$ in the three effects respectively.