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A digital wristwatch was set accurately at 8.30 am and then lost 2 sec

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V
Joined: 21 Jun 2014
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A digital wristwatch was set accurately at 8.30 am and then lost 2 sec  [#permalink]

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New post 16 Nov 2018, 08:45
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A
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E

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Question Stats:

88% (01:47) correct 12% (02:08) wrong based on 98 sessions

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A digital wristwatch was set accurately at 8.30 am and then lost 2 seconds every 5 minutes. What time was indicated on the watch at 6.30 pm of the same day, if the watch operated continuously until that time?

(A)5:56
(B)5:58
(C)6:00
(D)6:23
(E)6:26

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A digital wristwatch was set accurately at 8.30 am and then lost 2 sec  [#permalink]

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New post 16 Nov 2018, 08:55
1
Total Hours = 10 , total minutes = 10*60 , Total time intervals in each of which 2 sec is lost = 10*60/5 , Hence total seconds lost = 10* 60 * 2 /5
Hence, According to the Q.... total time lost = 10* 60 * 2 /5 seconds = 240 seconds = 240/60 mins i.e., 4 mins.
So the time shown will be 6:26 PM ( 4 min less than the actual time 6:30 PM)

Hence Ans E.
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Re: A digital wristwatch was set accurately at 8.30 am and then lost 2 sec  [#permalink]

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New post 27 Nov 2018, 12:16
HKD1710 wrote:
A digital wristwatch was set accurately at 8.30 am and then lost 2 seconds every 5 minutes. What time was indicated on the watch at 6.30 pm of the same day, if the watch operated continuously until that time?

(A)5:56
(B)5:58
(C)6:00
(D)6:23
(E)6:26

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its total 10 hrs from 8:30 to 6:30 pm
total = 10*60 = 600 mins
total 5 mins interval = 600/5 = 120
total sec lost = 120 *2 = 240sec
total min = 240/60 = 4 mins
subtract 4 mins from the 6:30

hence (E)
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Re: A digital wristwatch was set accurately at 8.30 am and then lost 2 sec  [#permalink]

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New post 04 Feb 2019, 10:04
HKD1710 wrote:
A digital wristwatch was set accurately at 8.30 am and then lost 2 seconds every 5 minutes. What time was indicated on the watch at 6.30 pm of the same day, if the watch operated continuously until that time?

(A)5:56
(B)5:58
(C)6:00
(D)6:23
(E)6:26


8:30 am -> 6:30 pm = 10 hrs

lost 2 seconds in 5 minutes
60 mins = 24 sec

10 hrs = 240 secs

60 secs = 1 min
240 secs = 4 min

6:30 - 4 mins = 6:26

E
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Re: A digital wristwatch was set accurately at 8.30 am and then lost 2 sec   [#permalink] 04 Feb 2019, 10:04
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