# Measure 9 minutes from 2 hourglasses puzzle

Using only a **Four-minute hourglass** and a **seven-minute hourglass**,

How will you measure exactly **nine minutes?**

Restriction:- Without the process taking longer than nine minutes.

We measure 7 Minute from One Hourglass. We reverse it at 7th minute

And, 4+4=8 Minutes from Second Hourglass – 8 Minutes

8(from 1)-7(From 2) = 1 Minute – 1 Minutes

TOTAL = **9 MINUTES**

**EXPLANATION-**

0 Minutes – Start both hourglass at the same time.

4 Minutes – The four minute glass runs out. Flip the four minute glass.

7 Minutes – The seven minute glass runs out. Flip the seven minute glass.

8 Minutes – The four minute glass runs out; the seven minute glass has been running for one minute. Flip the seven minute glass.

9 Minutes – The seven minute glass runs out.

Exactly what i thought

### Your Answer

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