BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

How long was the lantern off

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 226
Joined: Sun Aug 09, 2009 4:34 am

How long was the lantern off

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?
Top
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 399
Joined: Wed Apr 15, 2009 3:48 am
Location: india
Thanked: 39 times

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
Top
Master | Next Rank: 500 Posts
Posts: 268
Joined: Sat Aug 15, 2009 9:22 am
Thanked: 19 times
Followed by:1 members
GMAT Score:700

by capnx » Tue Oct 13, 2009 12:41 am
98min remained off
Top
Master | Next Rank: 500 Posts
Posts: 226
Joined: Sun Aug 09, 2009 4:34 am

by ern5231 » Tue Oct 13, 2009 1:55 am
Request you for explanations too
Top
Master | Next Rank: 500 Posts
Posts: 371
Joined: Fri Mar 06, 2009 2:48 am
Thanked: 27 times
GMAT Score:740

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
Top
Master | Next Rank: 500 Posts
Posts: 399
Joined: Wed Apr 15, 2009 3:48 am
Location: india
Thanked: 39 times

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
Top
Post new topic Post Reply
• Page 1 of 1