When we have two tree walks, they generate a unique tree. Suppose we traversed a tree T for an in$-$order tree walk and pre$-$order tree walk as follows;

In order tree walk of tree T $=\{15,28,35,38,40,45,55,60\}$

Pre order tree walk of tree T $=\{55,28,15,35,45,38,40,60\}$

What is the height of the tree T