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An hour-long test has 60 problems. If a student completes 30 problems

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An hour-long test has 60 problems. If a student completes 30 problems  [#permalink]

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New post 29 Dec 2018, 10:54
1
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

75% (00:54) correct 25% (00:25) wrong based on 16 sessions

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An hour-long test has 60 problems. If a student completes 30 problems in 20 minutes, how many seconds does he have on average for completing each of the remaining problems?

A. 60
B. 70
C. 80
D. 90
E. 100

Source: Kaplan GMAT Math Workbook - Sixth Edition
Page# 304

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Re: An hour-long test has 60 problems. If a student completes 30 problems  [#permalink]

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New post 29 Dec 2018, 11:03
1
Solution
Given that the test has 60 problems and allotted time is 60 min. And, the student completes 30 problems in 20 minutes.
Hence, the student has 40 min to complete the remaining 30 questions.

Average for completing each of the remaining problems = 40/30 min per question = (4/3) x 60 seconds per question = 80 seconds per question.

Hence, the correct answer is Option C. 80

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An hour-long test has 60 problems. If a student completes 30 problems  [#permalink]

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New post 29 Dec 2018, 11:08
1
Given:
Test has 60 problems.
A student completes 30 problems in 20 minutes, (Remaining : 30 Problems, 40 minutes)

Question: How many seconds does he have on average for completing each of the remaining problems?

\(\frac{(40 minutes * 60 seconds per min)}{30 Problems}\) = 80 seconds
Answer Option C is Correct
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An hour-long test has 60 problems. If a student completes 30 problems &nbs [#permalink] 29 Dec 2018, 11:08
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An hour-long test has 60 problems. If a student completes 30 problems

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