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How long was the lantern off

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by ern5231 » Tue Oct 13, 2009 12:12 am
If the door opens a lantern lights up. If the door does not open in the next 15 mins then the lantern goes off. The following is a record of the times when someone opened the door - 8:00,8:03,8:05,8:07,8:11,8:20,8:33,8:54,9:15,10:52.

How much time did the lantern remain off?
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by xcusemeplz2009 » Tue Oct 13, 2009 12:28 am
34 mins
It does not matter how many times you get knocked down , but how many times you get up
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by capnx » Tue Oct 13, 2009 12:41 am
98min remained off
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by ern5231 » Tue Oct 13, 2009 1:55 am
Request you for explanations too
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by 2010gmat » Tue Oct 13, 2009 2:12 am
8:00,8:03,8:05,8:07,8:11,8:20,8:33,8:54,9:15,10:52.

it will first go off at 8:48 and will remain so for next 6 mins
similarly it will remain off from 9:09 to 9:15 and then from 9:30 to 10:52

12 + 82 = 94 mins
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by xcusemeplz2009 » Tue Oct 13, 2009 2:24 am
condition 1 -door opens light on
condition 2 - light off after 15 min

time condition off time

8.00 on 0
8.03 on 0
8.05 on 0
8;07 on 0
8:11 on 0
8:20 on 0
8:33 on 0
8:48-8:54off 6

8:54 on 0
9:09-9:15off 6

9:15 on 0
9:30-9:52off 22
9:52 on 0
total 34 min

OA pls
It does not matter how many times you get knocked down , but how many times you get up
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