Hour Glass Problem : How can you calculate 9 minutes?

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You are given two hour glasses They 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 problem : How can you calculate 9 minutes?

You are given two hour glasses

They 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

 

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