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09 May 2018, 01:18
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
85% (01:15) correct
15%
(01:36)
wrong
based on 66
sessions
History
Date
Time
Result
Not Attempted Yet
A circular clock has a minute hand measuring 12 inches long. How far, in inches, does the outermost tip of the minute hand travel in 20 minutes?
A. 2π
B. 4π
C. 8π
D. 12π
E. 24π
A. 2π
B. 4π
C. 8π
D. 12π
E. 24π
09 May 2018, 04:01
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Solution
Given:
• A circular clock has a minute hand measuring 12 inches long
To find:
• How far, in inches, does the outermost tip of the minute hand travel in 20 minutes
Approach and Working:
• In 1 hour or 60 minutes time, the minute hand makes one whole revolution, completing a distance equivalent to the circumference of the circle
- o If the radius of the circle is 12 inches long, the circumference = 2 * π * 12 = 24π
- o Therefore, in 20 minutes, the distance the minute hand will cover = 20/60 * 24π = 8π
Hence, the correct answer is option C.
Answer: C
amandeep0306
Joined: 12 Feb 2018
Last visit: 12 Aug 2021
Posts: 5
Own Kudos:
Given Kudos: 32
Location: India
Schools: HEC Sept 2018 Intake Rotman '20
GMAT 1: 480 Q47 V12
GPA: 3.4
10 May 2018, 01:09
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Bunuel
In one minute change there is a change of 6 degrees.
20 min = 120 degrees change
So theta/360*2*pie*radius should be our answer = 120/360*2*pie*12=8*pie
option -C
