Determine the inner diameter $\backslash ($ d $\backslash )$ of the tube to the nearest mm if the allowable shear stress is $70$ MPa $.$

Express your answer in millimeters as an integer.

$\backslash [$

$\backslash$begin$\{$array$\}\{$l$|$l$|$l$\}$

$94$ & $\backslash$mathrm$\{$~mm$\}$

$\backslash$end$\{$array$\}$

$\backslash ]$