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A certain class, consisting of a lecture and a question-and-answer ses

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Bunuel
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A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   25 Jul 2018, 01:06
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A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon. If the lecture lasted from 2:45 to 4:15, then the question-and-answer session was what fraction of the total class time?

A) 1/7
B) 1/6
C) 1/5
D) 1/4
E) 1/3
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A
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Re: A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   25 Jul 2018, 01:29
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Total class time from 2:45 to 4:30 =>105

lecture lasted from 2:45 to 4:15 => 90 minutes

question-and-answer session lecture lasted from 4:15 to 4:30 => 15 minutes

question-and-answer session was what fraction of the total class time = \(\frac{15}{105}\) = \(\frac{1}{7}\)

Hence option A
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Re: A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   26 Jul 2018, 01:54
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Solution



Given:
    • A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon
    • The lecture lasted from 2:45 to 4:15

To find:
    • Fraction of question and answer session of the total class time
      o i.e. Question and Answer session time/Total class time.

Approach and Working:
    • We are given that the class lasted from 2:45 to 4:30 PM
      o i.e. a total of 1 Hour and 45 Minutes.
      o Converting the units into minutes we get:
         Total Cass Time: 105 Minutes (60 minutes + 45 minutes)

    • Lecture lasted from 2:45 to 4:15 PM
      o i.e. for 1 Hour and 30 Minutes
      o Converting into minutes we get
         Lecture time = 90 Minutes.

    • Therefore, Question-and-answer-session time = Class time – Lecture Time
      o i.e. 105 – 90 Minutes = 15 minutes

Hence Fraction of Question and answer time/Class time = \(\frac{15}{105} = \frac{1}{7}\)

Hence, the correct answer is option A.

Answer: A
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Re: A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   30 Jul 2018, 11:51
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Bunuel wrote:
A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon. If the lecture lasted from 2:45 to 4:15, then the question-and-answer session was what fraction of the total class time?

A) 1/7
B) 1/6
C) 1/5
D) 1/4
E) 1/3


The total time was 105 minutes, and the lecture was 90 minutes. Thus, the question-and-answer session was 15 minutes, which is 15/105 = 1/7 of the total class time.

Answer: A
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Re: A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   26 Aug 2021, 10:30
Bunuel wrote:
A certain class, consisting of a lecture and a question-and-answer session, lasted from 2:45 to 4:30 one afternoon. If the lecture lasted from 2:45 to 4:15, then the question-and-answer session was what fraction of the total class time?

A) 1/7
B) 1/6
C) 1/5
D) 1/4
E) 1/3


Can be solved with some mental math and approximation.

if the class were held from 2:30 sharp to 4:30 sharp, then total it would have been an even 2 hours= 120 mins. However since the class started at 2:45, all we need to do is reduce 15 mins from 120 mins to find the total minutes of the session = 120-15= 105 mins

The Q&A was clearly only 15 mins (from 4:15- 4:30). so the fraction can be calculated as= Q&A session/Total session time = 15 mins/105 mins= 1/7. final answe : A
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Re: A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   26 Aug 2021, 16:08
total class time: 105 min
lecture time: 90 min
Length of Q & A: 105 - 90 = 15 min
15/105 = 1/7
IMO Ans = A
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A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   26 Aug 2021, 23:34
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Duration b/w 2:45 to 4:30 = 105 minutes

Duration b/w 2:45 to 4:15 =90 minutes

Duration b/w 4:15 to 4:30 =15 minutes (QnA)

As a fraction, QnA/Total Class time = 15/105 = 1/7

(option a)

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Re: A certain class, consisting of a lecture and a question-and-answer ses [#permalink] New post   25 Jan 2023, 03:41
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Re: A certain class, consisting of a lecture and a question-and-answer ses [#permalink]
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