Based on the context and the answer, generate a question. 

Context: She 's big on magic wands and transformation right now . Em felt she was running a little late , so she said , " We 'll walk quickly . " She did . I had to stretch my legs a bit to keep her pace , and she was shorter than me by a foot and was wearing a pack .

Answer:

Shorter people typically have shorter legs and do not walk as fast .



Why is it interesting to know Em 's height ?