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