you have given two Sand clocks one is with 4 minute time cycle another is with 7 minute time cycle. count nine minutes with use of both clocks
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Explanation:
Start the 4 min and the 7 min together
Once 4 min have elapsed 3min remaining in 7 min clock, Turn over the 4 min clock,
Once 7 min have elpsed, there will be 1 min remaining in 4 min clock, so, turn over the 7 min clock, once that 1 min is over, 8 min have elapsed, here 1 min is in the bottom of 7 min clock, so turn 7 min clock over and after 1 min it will finish, telling you 9 minutes are over.
sumeet1908:
Okay
Start both clocks together
Thank you so much
When 4 min clock is complete, tip it over
When 7 min clock is complete, tip it over
Okay
When 4 min clock is again complete, Tip the 7 min clock over
When the 7 min clock completes now, denotes the passing of 9 minutes
Done
Wow that's really helpfull to me,
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