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In a monster truck, diameter of a rear wheel is thrice the diameter of
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20 Jun 2023, 00:54
20 Jun 2023, 00:54
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Question Stats:
88% (01:40) correct
11% (03:19) wrong based on 9 sessions
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In a monster truck, diameter of a rear wheel is thrice the diameter of the front wheel. In 10 seconds, the front wheel made 42 revolutions, how many revolutions did the rear wheel make?
A. 14
B. 21
C. 42
D. 126
E. 140
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A. 14
B. 21
C. 42
D. 126
E. 140
Post A Detailed Correct Solution For The Above Questions And Get Kudos.
Question From Our Project: Free GRE Prep Club Tests in Exchange for 20 Kudos
\(\Longrightarrow\) GRE - Quant Daily Topic-wise Challenge
\(\Longrightarrow\) GRE GEOMETRY
In a monster truck, diameter of a rear wheel is thrice the diameter of
[#permalink]
25 Jun 2023, 13:57
25 Jun 2023, 13:57
2
Let's pick, the dia of the front wheel is 2. So, dia of the rear wheel is 6.And the perimeter of the front wheel=πd=2π, which is the distance it covers in one revolution.
It made 42 revs, so a total distance of 42*2π=84π
Now, they are the wheels of the same car. So, if front wheel covers 84π, the rear wheel also covers that distance.
The rear wheel covers 6π distance per revolution. So, to cover 84π distance, it requires 84π/6π= 14 revs
Ans: A
Posted from my mobile device
It made 42 revs, so a total distance of 42*2π=84π
Now, they are the wheels of the same car. So, if front wheel covers 84π, the rear wheel also covers that distance.
The rear wheel covers 6π distance per revolution. So, to cover 84π distance, it requires 84π/6π= 14 revs
Ans: A
Posted from my mobile device
gmatclubot
In a monster truck, diameter of a rear wheel is thrice the diameter of [#permalink]
25 Jun 2023, 13:57
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