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A
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Difficulty:
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82% (01:33) correct
18%
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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)
(A) (490-x)/60
(B) (480-x)/60
(C) (470-x)/60
(D) 60 (60 – x + 7)
(E) 60 (60 – x + 17)
09 Jun 2009, 22:57
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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
\(= \frac{490-x}{60}\)
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
\(= \frac{490-x}{60}\)
General Discussion
03 Nov 2013, 04:52
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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
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
