How can one talk without saying a single word?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

If 1+9+8=1, what is 2+8+9?

Which country gets ill every time?

What is the last thing you take off before bed?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

Wednesday, Steve and Pam go to a restaurant to eat lunch. After eating lunch, they pay the bill. But Steve and Pam do not pay the bill. So…who does?

By using 'because' continuously three times, can you make an English statement ?