15 Minutes Challenge | Riddles | Don't Memorise

Nora needs to qualify one more round to get into the finale of the International IQ Genius Olympiad. And for that, Nora and her opponent need to solve one puzzle! They are provided with two hour-glasses. One measures 11 minutes and the other measures 7 minutes. With the help of only these hourglasses, they have to measure out exactly 15 minutes.
Will she be able able to make it through? Watch this video to know!

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