BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Speed problem

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Legendary Member
Posts: 712
Joined: Fri Sep 25, 2015 4:39 am
Thanked: 14 times
Followed by:5 members

Speed problem

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.
Top
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3008
Joined: Mon Aug 22, 2016 6:19 am
Location: Grand Central / New York
Thanked: 470 times
Followed by:34 members

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

-Jay
_________________
Manhattan Review GMAT Prep

Book of the day: Manhattan Review GMAT Word Problems

Locations: New York | Bangkok | Abu Dhabi | Rome | and many more...

Schedule your free consultation with an experienced GMAT Prep Advisor! Click here.
Last edited by Jay@ManhattanReview on Sun Jan 29, 2017 12:27 am, edited 1 time in total.
Top
Legendary Member
Posts: 712
Joined: Fri Sep 25, 2015 4:39 am
Thanked: 14 times
Followed by:5 members

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?
Top

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3008
Joined: Mon Aug 22, 2016 6:19 am
Location: Grand Central / New York
Thanked: 470 times
Followed by:34 members

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.

-Jay
_________________
Manhattan Review GMAT Prep

Locations: New York | Bangkok | Abu Dhabi | Rome | and many more...

Schedule your free consultation with an experienced GMAT Prep Advisor! Click here.
Top
Post new topic Post Reply
• Page 1 of 1