Can you Calculate 9 mins using 4 mins and 7 mins hour glass

Name: Can you Calculate 9 mins using 4 mins and 7 mins hour glass
Uploaded: 2017-09-10T07:15:19+00:00
Duration: 2 min 3 s
Channel: PuzzleBOT
Description: Professor BOT want to calculate 9 mins using 4 mins and 7 mins hour glass. Can you help professor to do it?

PuzzleBOT

Professor BOT want to calculate 9 mins using 4 mins and 7 mins hour glass.  Can you help professor to do it?

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