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How long would it take for ball moving in a straight line to travel 24

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How long would it take for ball moving in a straight line to travel 24  [#permalink]

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New post 05 May 2017, 03:50
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

69% (00:58) correct 31% (00:47) wrong based on 180 sessions

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How long would it take for ball moving in a straight line to travel 246 meters?

(1) The ball makes 12 complete rotations per meter.
(2) The ball completed half the trip in 1476 rotations

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Re: How long would it take for ball moving in a straight line to travel 24  [#permalink]

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New post 05 May 2017, 04:26
In this question its not clear whether we are asked to answer in terms of time (seconds, minutes etc) or in terms of 'number of rotations'. I would assume that we need to answer with 'time' and thus try to solve accordingly.

Statement 1 - ball completes 12 rotations in 1 m. So to cover 246 m, no of rotations required = 246 * 12 = 2952 rotations. But we don't know the speed of the ball or how many rotations the ball covers per unit time, so we cannot say anything about the time. Insufficient.

Statement 2 - if half trip can be covered in 1476 rotations, the full trip can be covered in 1476*2 = 2952 rotations. But we don't know the number of rotations per unit time, so we cannot answer. Insufficient.

Even after we combine, we get the same information - 2952 rotations, but nothing about the speed of the ball. Insufficient.
Answer is E.

(Please note that if in the first statement, we change the word 'meter' to 'minute', then we can solve using both statements. Then answer would be C)
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Re: How long would it take for ball moving in a straight line to travel 24  [#permalink]

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New post 07 May 2017, 10:50
stat1 : no info about time,,,not suff

stat 2: no info abt time,,, not suff

together not suff,,

ans E
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Re: How long would it take for ball moving in a straight line to travel 24  [#permalink]

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New post 21 Jun 2018, 08:04
amanvermagmat wrote:

Statement 2 - if half trip can be covered in 1476 rotations, the full trip can be covered in 1476*2 = 2952 rotations. But we don't know the number of rotations per unit time, so we cannot answer. Insufficient.



Hi. I think we can't assume that the full trip can be covered in 1476*2 rotations as it is not mentioned that the ball is moving at a constant speed. It could be so that the speed reduces due to friction.

Please correct if I'm wrong.
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Re: How long would it take for ball moving in a straight line to travel 24  [#permalink]

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New post 21 Jun 2018, 11:07
abhishek911 wrote:
amanvermagmat wrote:

Statement 2 - if half trip can be covered in 1476 rotations, the full trip can be covered in 1476*2 = 2952 rotations. But we don't know the number of rotations per unit time, so we cannot answer. Insufficient.



Hi. I think we can't assume that the full trip can be covered in 1476*2 rotations as it is not mentioned that the ball is moving at a constant speed. It could be so that the speed reduces due to friction.

Please correct if I'm wrong.


I think you have a point. Most likely in GMAT it would be mentioned in the question whether we have to assume the ball to be moving at a uniform speed or not.
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Re: How long would it take for ball moving in a straight line to travel 24  [#permalink]

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New post 28 Jun 2018, 03:03
This was a pretty simple one. Time is required. And there are no values that can help determining it.
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Re: How long would it take for ball moving in a straight line to travel 24 &nbs [#permalink] 28 Jun 2018, 03:03
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