**Two Hourglasses puzzle**

**You have two hourglasses.**

One contains seven minutes of sand and

the other contains eleven minutes of sand.

Using just these two hourglasses,

how can you accurately time fifteen minutes?

#### Click here for Answer

**Answer :**

First start both the hourglasses

but dont start counting time of 15min.

Now when the 7min hourglass finishes,

start counting time.

So now you will have 4 minutes left in 11 min hourglass.

After this 4min are over flip the hourglass and let it run its full 11mins

So you will get 4 + 11 = 15 minutes.