几道英语题,大家帮忙想想,急用啊

1.Who is the strongest men in the world?

2.Whyis the letter "u" the happiest letter?

3.Which trvels faster,heat or cold?

2. Why is the letter "u" the happiest letter

Because it is in the middle of "fun".

3.Which trvels faster,heat or cold?

Heat, because you can catch cold