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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.

Answers were Sorted based on User's Feedback

There are two sand clocks(timers) one complete totally in 7 minutes and other in 9-minutes we have..

1. Start both clocks
2. When 7 min clock complete, turn it so that it restarts.
3. when 9 min clock finesh, turn 7 min clocks (It has 2
mint only)
4. when 7 min clock fineshs, 11 min complete.

 Is This Answer Correct ? 19 Yes 4 No

There are two sand clocks(timers) one complete totally in 7 minutes and other in 9-minutes we have..

Hi Friends,

1. Start both clocks (7 and 9 mins)
2. When 7 min sand clock completes sand , turn it so that it restarts.
3. when 9 min clock finish, again turn 7 min clocks immediately (It has 2 mint only)
4. when 7 min clock finishes second time, 11 min will be competed.

Thats it... :)

 Is This Answer Correct ? 7 Yes 1 No

There are two sand clocks(timers) one complete totally in 7 minutes and other in 9-minutes we have..

Well said Friend.

 Is This Answer Correct ? 0 Yes 0 No

There are two sand clocks(timers) one complete totally in 7 minutes and other in 9-minutes we have..

hey I cudnot understand...

 Is This Answer Correct ? 0 Yes 0 No

There are two sand clocks(timers) one complete totally in 7 minutes and other in 9-minutes we have..

There are two sand clocks(timers) one complete totally in 4
minutes and other in 9-minutes we have to calculate with
this timers and bang the bell after completion of 7-
minutes!plz give me the solution.

 Is This Answer Correct ? 0 Yes 0 No

There are two sand clocks(timers) one complete totally in 7 minutes and other in 9-minutes we have..

You can ring the bell When the 7 min clock completes 10 min
and the 9 min clock completes 12 min

Sol: One complete round takes 8 min per both
If you ring the bell at 11 min First clock shows 10min and
second clock shows 12min
(10+12)/2=11min

 Is This Answer Correct ? 3 Yes 7 No

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