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22 Apr 2024, 01:30
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C
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Difficulty:
45%
(medium)
Question Stats:
69% (01:50) correct
31%
(01:50)
wrong
based on 377
sessions
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Time
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Not Attempted Yet
Two bicycle wheels, A and B, start rotating at constant speeds at the same time., How many seconds after the wheels start rotatins will wheel B have made 6 more rotations than wheel A?
(1) The rate of rotation of wheel B is three times that of wheel A
(2) The two wheels average 40 revolutions per minute
(1) The rate of rotation of wheel B is three times that of wheel A
(2) The two wheels average 40 revolutions per minute
Updated on: 23 Apr 2024, 10:21
Originally posted by PRAGATIOSTWAL on 23 Apr 2024, 01:55.
Last edited by PRAGATIOSTWAL on 23 Apr 2024, 10:21, edited 2 times in total.
Last edited by PRAGATIOSTWAL on 23 Apr 2024, 10:21, edited 2 times in total.
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I think the answer should be C.
Statement 1: NOT SUFFICIENT. Assuming the speed of the wheel A= x and B=3x, we cannot determine the individual actual speeds (which are required to answer this question).
Statement 2: NOT SUFFICIENT. The average speed also doesn't help to determine the individual actual speeds (which are required to answer this question).
Putting Statement 1 and Statement 2 together
The individual speeds can be determined by the formula: Average Speed= (S1+S2)/2
40= x+3x/2
x= 20 revolutions per min (Speed of A)
3x= 60 revolutions per min(Speed of B)
Relative Distance= 6 rotations (given in the question stem)
Relative Speed= 60-20 revolutions per min (calculated above)
Time= Relative Distance/Relative Speed
= 6*60/40
= 9 secs
Statement 1: NOT SUFFICIENT. Assuming the speed of the wheel A= x and B=3x, we cannot determine the individual actual speeds (which are required to answer this question).
Statement 2: NOT SUFFICIENT. The average speed also doesn't help to determine the individual actual speeds (which are required to answer this question).
Putting Statement 1 and Statement 2 together
The individual speeds can be determined by the formula: Average Speed= (S1+S2)/2
40= x+3x/2
x= 20 revolutions per min (Speed of A)
3x= 60 revolutions per min(Speed of B)
Relative Distance= 6 rotations (given in the question stem)
Relative Speed= 60-20 revolutions per min (calculated above)
Time= Relative Distance/Relative Speed
= 6*60/40
= 9 secs
General Discussion
22 Apr 2024, 16:10
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A since
State 1 gives the relation required
Statement 2 is insufficient
Posted from my mobile device
State 1 gives the relation required
Statement 2 is insufficient
Posted from my mobile device
