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There are how many hours between x minutes past 12 noon and

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There are how many hours between x minutes past 12 noon and  [#permalink]

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New post Updated on: 03 Nov 2013, 05:51
3
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

81% (01:29) correct 19% (01:50) wrong based on 241 sessions

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There are how many hours between x minutes past 12 noon and 8:10 p.m. of the same day, where x < 60?

(A) (490-x)/60
(B) (480-x)/60
(C) (470-x)/60
(D) 60 (60 – x + 7)
(E) 60 (60 – x + 17)

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http://gmatclub.com/forum/countdown-beginshas-ended-85483-40.html#p649902


Originally posted by tejal777 on 09 Jun 2009, 20:24.
Last edited by Bunuel on 03 Nov 2013, 05:51, edited 1 time in total.
Edited the question.
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Re: how many hours ?easy one.  [#permalink]

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New post 09 Jun 2009, 22:57
10
The answer is A

Asking how many hours are there between x minutes past 12 noon and 8:10 p.m. of the same day, where x < 60.

Lets count the mins from 12:00 noon to 8:10 pm
From 12:00PM to 8:00PM = 8 hrs and from 8:00PM to 8:10PM = 10 mins
=> 8 hrs x 60 mins + 10 mins = 490 mins

Now that its already x mins past 12:00 noon
lets subtract x from 490 to count the mins from x past noon to 8:10 pm.

(490-x) mins

convert this to hours by dividing by 60

\(= \frac{490-x}{60}\)
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Re: There are how many hours between x minutes past 12 noon and  [#permalink]

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New post 03 Nov 2013, 04:52
One could also solve by assuming x. The condition for x is x<60
Suitable assumption can be x=10. Now 12:10 to 8:10 pm is 8 hours.
Substitute x as 10 in options too and which ever option gives you 8 hours will be your answer
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Re: There are how many hours between x minutes past 12 noon and  [#permalink]

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New post 17 Feb 2014, 15:13
1
Let's just say that X is equal to 10 so we will have that the number of hours will be 8, this is our target value. Now plug 10 in the answer choices to see which gives 8.

A is correct here.

Hope this helps
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Re: There are how many hours between x minutes past 12 noon and  [#permalink]

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New post 25 May 2017, 23:33
Three of the answer options are something/60, which means minutes have been converted to hours. (1hour = 60 minutes)
So lets find out the minutes which have passed, and we can divide the answer by 60 to get the answer in hours.

Firstly, from 12 to 8.10 pm, no of minutes = 8*60 + 10 = 490 minutes
But 'x' minutes have already passed after 12. So net minutes passed = (490-x)

Converting it to hours = (490-x)/60

Hence answer is A
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Re: There are how many hours between x minutes past 12 noon and &nbs [#permalink] 25 May 2017, 23:33
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