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How you can meaure 3 minute using 7 minute and 11 minute sand clock without using any electric instruments?
Wiki User
∙ 12y ago
Start both sand clocks off at the same time.
When the 7-minute clock runs out turn it over.
When the 11-minute clock runs out turn it over.
START TIMING.
When the 7-minute clock next runs out it will have been 3 minutes.
Wiki User
∙ 12y ago
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