Measure by Hourglass

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?




Similar Riddles

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Asked by Neha on 16 Jun 2023


There is an exact a week gap between Christmas and New Year. Hence, It is obvious that the new year that comes right after Christmas comes on the same day of the week.

A Strange thing happened in the Year 1777. Christmas occurs on Wednesday and New Year on Monday. How is that possible?

Asked by Neha on 19 Dec 2025

What word is pronounced the same if you take away four of its five letters?

Asked by Neha on 20 Oct 2021


Which is faster, Heat or Cold ? Explain.

Heat or Cold ?

Asked by Neha on 23 Mar 2021

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?

Who is Who

Asked by Neha on 16 Mar 2021

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

Asked by Neha on 12 Dec 2024


In the image below, can you find the value of an angle(y)

The angle of a triangle

Asked by Neha on 17 May 2023

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

Asked by Neha on 20 Aug 2025

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Asked by Neha on 01 Oct 2021


Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Asked by Neha on 14 Jan 2026

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.