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GRE Math Challenge #38- watch gains 7 minutes & 6 seconds
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19 Sep 2014, 03:17
19 Sep 2014, 03:17
Expert Reply
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Question Stats:
92% (00:43) correct
8% (01:10) wrong based on 25 sessions
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A watch gains 7 minutes & 6 seconds every 6 days. If the rate of gain is constant, how much does the watch gain in one day?
A. 1 min 1 sec
B. 1 min 6 sec
C. 1 min 11 sec
D. 1 min 16 sec
E. 1 min 21 sec
A. 1 min 1 sec
B. 1 min 6 sec
C. 1 min 11 sec
D. 1 min 16 sec
E. 1 min 21 sec
Re: GRE Math Challenge #38- watch gains 7 minutes & 6 seconds
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18 Sep 2017, 23:51
18 Sep 2017, 23:51
1
6*60*60/7*60+6
Re: GRE Math Challenge #38- watch gains 7 minutes & 6 seconds
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19 Sep 2017, 05:31
19 Sep 2017, 05:31
1
Pushkar96 wrote:
6*60*60/7*60+6
What's that? Can you explain your idea? It is not so clear without parenthesis
Anyway, if we convert all to seconds, i.e. 7 minutes = 420 seconds (7*60) + 6 seconds = 426 seconds every six days. Thus, in one day the watch gains 426/6 = 71 seconds or 1 minute and 11 seconds. Answer C
