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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Answer of the puzzle How can you calculate 9 minutes is :
To get 9 minutes first let both the glasses run together. After 4 minutes first glass (4 minute) will be empty so turn/revers that and let it run again. At this point of time second glass (7 minutes) will still be running.
After 3 minutes (total minutes measured so far is 7) second glass will be empty. Now turn/reverse that again and let it run.
After another 1 minute (total minutes measured so far is 8) once again first glass will be empty but the crux here is second glass has only run for 1 minute. What you need to do is immediately turn/reverse the second glass. The second glass will run for another 1 minute and that will be your total 9 minutes.
If you have another easy method do share in the comment section.
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