为什么英语中回答是时间，但却要用how far来提问？

用how
long提问,动词必须是延续性动词，时态一般要用完成时
how
long
had
you
been
here?
About
two
weeks.
how
long也可以问长度
How
long
is
Changjia
River?
how
far一般问距离，
How
far
is
it
from
here
to
the
gardon?
It’s
2
kilometres
但是！！！
It
takes
us
two
hours
to
go
to
school
from
our
home.提问应为How
far
is
it
from
your
home
to
school?
隐含距离因素