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GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2508
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GPA: 3.39
Two wheels are connected via a conveyor belt. The larger wheel has a 4
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06 Apr 2021, 00:10
06 Apr 2021, 00:10
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88% (01:59) correct
11% (01:54) wrong based on 9 sessions
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Two wheels are connected via a conveyor belt. The larger wheel has a 40cm diameter and the smaller wheel has a 32cm diameter. In order for the conveyor belt to work smoothly, each wheel must rotate the exact same number of centimetres per minute. If the larger wheel makes r revolution per minute, how many revolutions does the smaller wheel make per hour in terms of r?
A. \(1280π\)
B. 75r
C. 48r
D. 24r
E. \(\frac{64π}{3}\)
A. \(1280π\)
B. 75r
C. 48r
D. 24r
E. \(\frac{64π}{3}\)
Two wheels are connected via a conveyor belt. The larger wheel has a 4
[#permalink]
06 Apr 2021, 22:19
06 Apr 2021, 22:19
1
Quote:
In order for the conveyor belt to work smoothly, each wheel must rotate the exact same number of centimetres per minute.
This means that both wheels cover same distance in one minute.
By the way, for any wheel, distance = revolutions x circumference.
Quote:
If the larger wheel makes r revolution per minute, how many revolutions does the smaller wheel make per hour in terms of r?
Let's assume that smaller wheel makes s revolutions per hour. (But since revolutions of larger wheel is represented in minutes, we must convert s revolutions per hour to s/60 revolutions per minute.)
Since, both wheel cover same distance, let's equate, keeping the distance same.
\(r * 40 * pi = \frac{s}{60} * 32 * pi\)
\(s = 75 * r\)
Hence, B is the correct answer.
gmatclubot
Two wheels are connected via a conveyor belt. The larger wheel has a 4 [#permalink]
06 Apr 2021, 22:19
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