The fireman is driving the fire-engine (at a about 100 miles an hour now.)就划线部分提问
问题描述：
The fireman is driving the fire-engine (at a about 100 miles an hour now.)就划线部分提问
（ ） （ ） （ ） the fireman driving the fire-engine?
（提问和补充说明是一道题）
答
How fast is the fireman driving the fire-engine?