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

A sundial has the fewest moving parts of any timepiece. Which has the most?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Rearrange the letters in "new door" to make one word.

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Six people park their car in an underground parking of a store. The store has six floors in all. Each one of them goes to a different floor. Simon stays in the lift for the longest. Sia gets out before Peter but after Tracy. The first one to get out is Harold. Debra leaves after Tracy who gets out on the third floor.

Can you find out who leaves the lift on which floor?

How do you go from 98 to 720 using just one letter?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?