There Are Two Sand Clocks(timers) One Complete Totally In 7 Minutes And Other In 9-minutes We Have To Calculate With This Timers And Bang The Bell After Completion Of 11- Minutes!plz Give Me The Solution.

There Are Two Sand Clocks(timers) One Complete Totally In 7 Minutes And Other In 9-minutes We Have To Calculate With This Timers And Bang The Bell After Completion Of 11- Minutes!plz Give Me The Solution.


  • 20 Jan, 2012

    1. Start both clocks2. When 7 min clock complete, turn it so that it restarts.3. When 9 min clock finish, turn 7 min clocks (It has 2 mints only).4. When 7 min clock finishes, 11 min complete.

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