---I left my pen at home.  ---___! Use mine.

A．Here you are

B．Here it is

C．Give it to you

D．It is here.

一只蜜蜂0.5小时飞行9.3千米，是一只蝴蝶飞行速度的2.4倍．这只蝴蝶每小时飞行多少千米？