I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Name a key which is hardest to turn.

I look at you, you look at me, I raise my right, you raise your left. What am I?

What's the best place to go shopping in the ocean?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Can you write down eight eights so that they add up to one thousand?

Imagine you are in a room with no windows or doors. How will you get out?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?