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.
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Answer / p73_73@yahoo.com
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 |
Answer / hemanthdeva
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 |
Answer / elavenil
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 |
Answer / rayudu
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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