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The time it takes to erect a bonfire is inversely proportion

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GMAT Club Legend
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Joined: 07 Jun 2014
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GRE 1: Q167 V156
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The time it takes to erect a bonfire is inversely proportion [#permalink] New post 19 May 2018, 15:25
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Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 3 sessions
The time it takes to erect a bonfire is inversely proportional to the number of students doing the work. If it takes 20 students 1.5 hours to do the job, how long will it take 35 students to do the job, to the nearest minute?

(A) 51
(B) 52
(C) 53
(D) 54
(E) 55
[Reveal] Spoiler: OA

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Re: The time it takes to erect a bonfire is inversely proportion [#permalink] New post 21 May 2018, 21:05
20 students take 90 minutues.

1 student would take 90*20 = 1800 minutes.

35 students would equally divide this total time, hence 1800/35

=51.4

When rounded to nearest whole number it would be 51 minutes.

However, I doubt if this is correct. As in 51 minutes a fraction of work would be still left undone. So how do we choose between 51 and 52.
Re: The time it takes to erect a bonfire is inversely proportion   [#permalink] 21 May 2018, 21:05
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The time it takes to erect a bonfire is inversely proportion

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