How many words can a pen with half refill write?

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?

Can you find the thief by just looking at the picture below?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?

I know a nine-letter word having only one vowel.
Do you ?

What can you deduce from the following BrainBat?

CRY
LMKI

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

How can you make a TV, a bed, a dog, and a car liquid?

I am white when I am dirty, and black when I am clean. What am I?

I always drive my customer away.

Who am I?