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

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Senior RC Moderator
Status: Preparing GMAT
Joined: 02 Nov 2016
Posts: 2757
Location: Pakistan
GPA: 3.39
An hour-long test has 60 problems. If a student completes 30 problems  [#permalink]

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29 Dec 2018, 11:54
1
00:00

Difficulty:

25% (medium)

Question Stats:

90% (00:48) correct 10% (01:08) wrong based on 24 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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Senior Manager
Joined: 15 Jan 2018
Posts: 334
Concentration: General Management, Finance
GMAT 1: 720 Q50 V37
Re: An hour-long test has 60 problems. If a student completes 30 problems  [#permalink]

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29 Dec 2018, 12:03
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
Manager
Joined: 26 Dec 2018
Posts: 142
Location: India
An hour-long test has 60 problems. If a student completes 30 problems  [#permalink]

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29 Dec 2018, 12:08
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
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An hour-long test has 60 problems. If a student completes 30 problems   [#permalink] 29 Dec 2018, 12:08
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