Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

72% (01:23) correct 28% (01:20) wrong based on 296 sessions

HideShow timer Statistics

Did it take a certain ship less than 3 hours to travel 9 kilometers? (1 kilometer = 1,000 meters)

(1) The ship's average speed over the 9 kilometers was greater than 55 meters per minute. (2) The ship's average speed over the 9 kilometers was less than 60 meters per minute.

Did it take a certain ship less than 3 hours to travel 9 kilometers? (1 kilometer = 1,000 meters)

(1) The ship's average speed over the 9 kilometers was greater than 55 meters per minute. (2) The ship's average speed over the 9 kilometers was less than 60 meters per minute.

Kudos for a correct solution.

Question : Did it take a certain ship less than 3 hours to travel 9 kilometers? Speed = Distance / Time = 9/3 = 3 km per hour

Question REDEFINED: Is the Speed of certain Ship less than 3 km per hour?

Statement 1: The ship's average speed over the 9 kilometers was greater than 55 meters per minute.

i.e Average Speed of Ship > 55 meters per min i.e. Average Speed of Ship > (55/1000) / (1/60) i.e. Average Speed of Ship > 55*60 / 1000 Km per hour i.e. Average Speed of Ship > 3.3 Km per Hour

hence, SUFFICIENT

Statement 2: The ship's average speed over the 9 kilometers was less than 60 meters per minute.

i.e Average Speed of Ship < 60 meters per min i.e. Average Speed of Ship < (60/1000) / (1/60) i.e. Average Speed of Ship < 60*60 / 1000 Km per hour i.e. Average Speed of Ship < 3.6 Km per Hour

i.e. Average speed could be greater than or less than 3 km per hour

Prosper!!! GMATinsight Bhoopendra Singh and Dr.Sushma Jha e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772 Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi http://www.GMATinsight.com/testimonials.html

Did it take a certain ship less than 3 hours to travel 9 kilometers? (1 kilometer = 1,000 meters)

(1) The ship's average speed over the 9 kilometers was greater than 55 meters per minute. (2) The ship's average speed over the 9 kilometers was less than 60 meters per minute.

Kudos for a correct solution.

1) stat 1 tells us that the avg speed was >55 m per min.. so in 3 hours it would travel>55*3*60 or 9900... so the ship took less than 3 hrs to travel 9 kms... suff

2) stat 2 tells us that the avg speed was <60 m per min.. so in 3 hours it would travel<60*3*60 or 10800... so the ship could have travelled <>=9 kms... insuff

Re: Did it take a certain ship less than 3 hours to travel 9 kilometers? [#permalink]

Show Tags

23 Jun 2015, 10:12

1

This post received KUDOS

Rephrasing the question in terms of speed since the options A and B are given in average speed.

Traveling 9 KMs in less than 3 hours means speed should be greater than (s=d/t) s> 9/3 or 3 KM/Hour or 3000 Meters/60 Mins or 50 meters/mins . So, we can rephrase the question as Is average speed is greater than 50 Meters/Min ?

(A) Sufficient

(B) Insufficient. Speed can be 10 meters/min, 50 meters/min or 59 meters/min (All are less than 60 meters/min)

Did it take a certain ship less than 3 hours to travel 9 kilometers? [#permalink]

Show Tags

23 Jun 2015, 11:38

1

This post received KUDOS

Formula : Dist = Speed * Time If Dist is constant & Speed Increases -> Time will decrease If Dist is constant & Speed Decreases -> Time will Increase

Using statement 1: Speed Min ~ 55m/min, Dist = 9000m Time Max = Dist/Speed Min = 9000/55 = 163mins < 3 Hrs [If speed > 55, time will decrease further] Therefore sufficient!

Using statement 2: Speed Max ~ 60m/min, Dist = 9000m Time Min = Dist/Speed Max = 9000/60 = 150mins [If speed decreases, time will increase further & may even exceed 3 hrs ] Therefore Insufficient!

Re: Did it take a certain ship less than 3 hours to travel 9 kilometers? [#permalink]

Show Tags

28 Jun 2015, 08:49

1

This post received KUDOS

Speed = Distance / Time And Avg Speed = Total Distance/Total Time St 1 - Avg speed = more than 55meter/min = 55/1000 x 1/60(min) = 3.3km/h 9/3.3 < 3 for sure Suff St 2 - Avg speed = less than 60meter/min = lets say 20/1000x1/60 = 1.2km/h 9/1.2 > 3 also lets take Avg speed = 59meter/min = 9 / (59/1000 x 1/60) < 3

Did it take a certain ship less than 3 hours to travel 9 kilometers? (1 kilometer = 1,000 meters)

(1) The ship's average speed over the 9 kilometers was greater than 55 meters per minute. (2) The ship's average speed over the 9 kilometers was less than 60 meters per minute.

Notice that the statements provide rates in meters per minute. A good first step here is to figure out how fast the ship would have to travel to cover 9 kilometers in 3 hours. Create an RTD chart, and convert kilometers to meters and hours to minutes:

180r= 9,000 r= 50

The question asks whether the ship traveled 9 kilometers in less than 3 hours. The ship must travel faster than 50 meters/min to make it in less than 3 hours. Therefore, the question is really asking, is r > 50?

(1): SUFFICIENT: If the average speed of the ship was greater than 55 meters per minute, then r > 55. Thus, r is definitely greater than 50.

(2): INSUFFICIENT: If the average speed of the ship was less than 60 meters per minute, then r < 60. This is not enough information to guarantee that r > 50.

Re: Did it take a certain ship less than 3 hours to travel 9 kilometers? [#permalink]

Show Tags

06 Oct 2017, 01:32

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________