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14 Sep 2018, 01:39
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
67% (01:37) correct
33%
(01:24)
wrong
based on 53
sessions
History
Date
Time
Result
Not Attempted Yet
John and Peter decide to race along two concentric circular paths. John runs along the outer circle while Peter runs along the inner circle. How fast should John run so that they both complete a lap in the same amount of time?
(1) The difference in radius between the two circles is 2 miles.
(2) Peter runs at a speed of 6 miles per hour.
Attachment:
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15 Sep 2018, 06:27
Kudos
Bookmarks
Bunuel
For Peter and John to complete the lap in same amount of time
Ratio of distances covered by them = ratio of their speeds
Also, Ratio of distances covered by them = Ratio of Radius/Diameters/Circumference of track
Question: ow fast should John run so that they both complete a lap in the same amount of time?
Statement 1: The difference in radius between the two circles is 2 miles.
We don't have the ratio of radius as we only get the difference here hence
NOT SUFFICIENT
Statement 2: Peter runs at a speed of 6 miles per hour..
We don't have the ratio of radius as we only get the speed of one person here hence
NOT SUFFICIENT
Combining the two statements
We still don't ave the ratio of radius nor do we have ratio of their speeds hence
NOT SUFFICIENT
Answer: option E
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