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# Riders on a Ferris wheel travel in a circle in a vertical plane. A par

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Math Expert
Joined: 02 Sep 2009
Posts: 59589
Riders on a Ferris wheel travel in a circle in a vertical plane. A par  [#permalink]

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19 Mar 2019, 01:34
00:00

Difficulty:

65% (hard)

Question Stats:

35% (01:57) correct 65% (02:14) wrong based on 23 sessions

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Riders on a Ferris wheel travel in a circle in a vertical plane. A particular wheel has radius 20 feet and revolves at the constant rate of one revolution per minute. How many seconds does it take a rider to travel from the bottom of the wheel to a point 10 vertical feet above the bottom?

(A) 5
(B) 6
(C) 7.5
(D) 10
(E) 15

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Concentration: Sustainability, Marketing
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Re: Riders on a Ferris wheel travel in a circle in a vertical plane. A par  [#permalink]

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19 Mar 2019, 04:17
Bunuel wrote:
Riders on a Ferris wheel travel in a circle in a vertical plane. A particular wheel has radius 20 feet and revolves at the constant rate of one revolution per minute. How many seconds does it take a rider to travel from the bottom of the wheel to a point 10 vertical feet above the bottom?

(A) 5
(B) 6
(C) 7.5
(D) 10
(E) 15

draw figure we can conclude that triangle 30-60-90
so angle formed at center to 10 feet = 60*
i.e 60/360 = 1/6 th of complete revolution
i.e 60 * 1/6= 10 seconds
IMO D
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Joined: 02 Sep 2018
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Re: Riders on a Ferris wheel travel in a circle in a vertical plane. A par  [#permalink]

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19 Mar 2019, 23:50
Why is it not not 7.5? The angle formed at 10feet is 45deg and that's 1/8 of of a revolution. My answer was C. Can't visualise the 30-60-90 triangle

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GMAT Club Legend
Joined: 18 Aug 2017
Posts: 5436
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Riders on a Ferris wheel travel in a circle in a vertical plane. A par  [#permalink]

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20 Mar 2019, 00:02
uofidhe wrote:
Why is it not not 7.5? The angle formed at 10feet is 45deg and that's 1/8 of of a revolution. My answer was C. Can't visualise the 30-60-90 triangle

Posted from my mobile device

uofidhe
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Riders on a Ferris wheel travel in a circle in a vertical plane. A par   [#permalink] 20 Mar 2019, 00:02
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