Time Measurement
Use 7 and 11 after 7 passed start measuring after 11 passed upturn it and continue measuring
What do you mean by “… after 7 passed start measuring after 11 passed”?
after 7 minute hour glass sand settled down
thats what i mean
“after 7 passed start measuring … ” Start measuring what??
time
That I know! But you said “after 7 passed start measuring…’. Do you mean to say that you were not measuring till then? Also, you said ‘start measuring’ – how? Using the 11? In that case, you will end up with 7 + 11 = 18 min.
we ignore the time passed till then and then start measuring it.if u start measuring when 7 passed after both 11 and 7 were used and total time u will measure will be the time of remaining sand in hour glass of 11 =4 minutes and after upturning 11 again after the sand settled =11 minutes
4+11 = 15
The question doesn’t provide for “ignoring” any timeframe. You can’t arbitrarily insert ‘gaps’ as per convenience.
I didn’t inserted gaps I started late pls this is too foolish if you can’t see this after so much explanation. The question didn’t state you have to start measuring now
“Starting late” has the drawback that it won’t work when required immediately. e.g. If someone says ‘I am going to the store to get something. If I don’t return in 15 min., you should come to my help.’ In this situation, you can’t use your method to measure the time.
What your method actually measures is 22 minutes, NOT 15 min. as required in the question because before starting ‘your‘ measurement, you have actually ‘measured’ 7 minutes (because you waited till the 7-min glass drained out). even though you chose to ignore it. (Had you started measuring while the7-min glass was running, you could have claimed that you didn’t measure the time before starting, because you don’t know how much time had passed before you started.)
Because you do not understand a simple thing we have to measure 15 minutes it does not say now it is a question not a life problem you have thought about the use of the problem unnecessarily or its your grudge against me
When somebody asks someone to measure something, it implies that the measurement should be done when asked and not after some random time as per the other person’s convenience. If I were a nurse and you, a doctor (or my colleague), and you asked me to measure a patient’s temperature / BP, I would do it immediately when asked (unless specifically asked to wait for ‘x’ minutes) and NOT after, say, half an hour (at my convenience), claiming that you didn’t say ‘measure it now / immediately‘. As simple as that.
it is not a life problem but a puzzle if your are too dense then i cant help sorry
Start both the 7-min and 11-min glasses simultaneously. After the 7-min one runs out, turn it upside down and let it continue to run. By the time the 11-min glass runs out (11 min. passed), the 7-min. glass will have run for 4 min. after it was upturned first. Turn it upside down again and continue. It will run out in the next 4 min. , completing 15 min.
u didnt need to think this much
Your Answer
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