Hour glass problem | with Answer

You are given two hour glass which can measure 4 and 7 min respectively. now you have to calculate 9 min using these two hour glass (Note: you have to calculate it at a stretch)

hour glass puzzle

Start both 7 min & 4 min hour glass at the same time.
Once the 4 min hour glass is completed, then reverse it.
Now 7 hour glass is at 4 min and 3 min is remaining ion that.
when 7 hour glass completes then reverse it.
The reversed 4 hour glass still has 1 min to complete.
After you reverse 7 hour glass wait unitl the 4 hour glass to be completed thereby your total is 9 min.

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