Answer :
Ben is taller, 1090mm into m = 109cm
[tex] \left[\begin{array}{ccc}1&^{3} 4& ^{10} 0\\1&0&9\\\\&3&1\end{array}\right] [/tex] so 31cm taller
[tex] \left[\begin{array}{ccc}1&^{3} 4& ^{10} 0\\1&0&9\\\\&3&1\end{array}\right] [/tex] so 31cm taller