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18 Sep 2018, 21:59
Kudos
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
32% (01:10) correct
68%
(01:15)
wrong
based on 134
sessions
History
Date
Time
Result
Not Attempted Yet
If John traveled 9 miles on his unicycle, what was his speed in miles per hour?
(1) The unicycle has spokes that stretch the 23 inches from the center of the wheel to inner edge of the wheel.
(2) John pedals his unicycle at 19 revolutions per minute.
(1) The unicycle has spokes that stretch the 23 inches from the center of the wheel to inner edge of the wheel.
(2) John pedals his unicycle at 19 revolutions per minute.
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
https://gmatclub.com/forum/data-sufficiency-ds-141/
https://gmatclub.com/forum/data-sufficiency-ds-141/
26 Sep 2018, 23:16
Kudos
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Bunuel
distance = 9 miles = n*2 \(\pi\)r (where n is the number of revolutions made by the unicycle)
speed = \(\frac{distance}{time}\) =\(\frac{9}{time}\) = ?
(1) The unicycle has spokes that stretch the 23 inches from the center of the wheel to inner edge of the wheel.
we are given radius = 23 inches
substituting the value back into the equation 9 miles = n*2 \(\pi\)r will give us n (number of revs)
time =?
not sufficient
(2) John pedals his unicycle at 19 revolutions per minute.
again we are not given time
not sufficient
E
27 Sep 2018, 01:20
Kudos
Bookmarks
Bunuel
Fact:D=9 Miles, t=?, S=?
Question:Speed=Distance/Time=?
Condition1: The unicycle has spokes that stretch the 23 inches from the center of the wheel to inner edge of the wheel.
Please note it's given as inner edge. Not outer edge which would have given the exact circumference of wheel needed for calculation.
Not Sufficient.
Condition2: he moves at 19Revs/min= 1140 Revs/hr.
But not sufficient.
Condition (1)+(2): Circumference*revs/hr would give the distance travelled in 1 hour in inches/hr unit. Convert it to miles/in 1 hr. Divide 9 Miles/this figure to get the time.
BUT as stated in condition (1) Inner dia would not be accurate to solve this question, for this we need outer dia or circumference.
So, NOT SUFFICIENT.
ANS-E
