$.$ Steam condensing on the outer surface of a thin$-$walled circular tube of diameter $=50$ mm

maintains a uniform outer surface temperature of $100$C$.$ Water flows through the tube at a rate

of m$=0\mathrm{.}25$ kg$/$s$,$ and its inlet and outlet temperatures are Ti$=15$C and To$=57$C$.$ Determine the

total tube length if average convection coefficient is $753$ W$/$m$2$K$.$ Show work please.