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Speed problem

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by Mo2men » Tue Jan 17, 2017 2:31 pm
How long would it take for ball moving in a straight line to travel 246 meters?

(1) The ball travels 43 meters per minute.
(2) The ball completed one-fourth the trip in 78 rotations.
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by Jay@ManhattanReview » Sat Jan 28, 2017 1:34 am
Mo2men wrote:How long would it take for ball moving in a straight line to travel 246 meters?

(1) The ball travels 43 meters per minute.
(2) The ball completed one-fourth the trip in 78 rotations.
May I know the source of this question? 'trip' in statement 2 is undefined. It's confusing.

This looks to be a simple Speed/Time/Distance problem.

S1: Time taken = total distance/speed = 246/43 = a unique value. No need to calculate since we are satisfied that we get a real number. Sufficient.

S2: Though we can get how many rotations the ball takes to make a 'trip', we cannot related the number of rotations to meters. Moreover, there is no information about time. Insufficient.

Answer: A

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Last edited by Jay@ManhattanReview on Sun Jan 29, 2017 12:27 am, edited 1 time in total.
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by Mo2men » Sat Jan 28, 2017 3:49 am
Jay@ManhattanReview wrote: S2: Though we can get how many rotations the ball takes to make a 'trip', we cannot related number of rotations to meters. Insufficient.

Answer: A
Hi Jay,

The question was posted in GMAT club.

In statement 2, how can I rotation to distance completed? Isn't one fourth equals to 61.5 meters? When statement 2 will be sufficient?
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by Jay@ManhattanReview » Sun Jan 29, 2017 12:38 am
Mo2men wrote:
Jay@ManhattanReview wrote: S2: Though we can get how many rotations the ball takes to make a 'trip', we cannot relate the number of rotations to meters. Moreover, there is no information about time. Insufficient.

Answer: A
Hi Jay,

The question was posted in GMAT club.

In statement 2, how can I rotation to distance completed? Isn't one fourth equals to 61.5 meters? When statement 2 will be sufficient?
Yes, you are right, if we assume that 'trip' means the movement of the ball from one end to the other, but we do not have information about time. We want time as an answer. Insufficient.

Hope this is clear.

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