Apr 21 10:00 PM PDT  11:00 PM PDT $84 + an extra $10 off for the first month of EMPOWERgmat access. Train to be ready for Round 3 Deadlines with EMPOWERgmat's Score Booster. Ends April 21st Code: GCENHANCED Apr 22 08:00 AM PDT  09:00 AM PDT What people who reach the high 700's do differently? We're going to share insights, tips, and strategies from data we collected on over 50,000 students who used examPAL. Save your spot today! Apr 21 07:00 AM PDT  09:00 AM PDT Get personalized insights on how to achieve your Target Quant Score. Apr 23 08:00 PM EDT  09:00 PM EDT Strategies and techniques for approaching featured GMAT topics. Tuesday, April 23rd at 8 pm ET Apr 24 08:00 AM PDT  09:00 AM PDT Join the Live Chat April 24th at 8 am PT. Learn the best strategies for acing the Verbal section. From Sentence Correction tactics to 3 keys for solving Reading Comprehension questions and tips for Critical Reasoning questions. Apr 24 08:00 PM EDT  09:00 PM EDT Maximize Your Potential: 5 Steps to Getting Your Dream MBA Part 3 of 5: Key TestTaking Strategies for GMAT. Wednesday, April 24th at 8 pm ET Apr 25 10:00 PM PDT  11:00 PM PDT Join an exclusive workshop for GMAT Club members and learn how to cut your preparation time by 50% and still reach a 700+ on the GMAT. Limited for the first 99 registrants. Register today! Apr 27 07:00 AM PDT  09:00 AM PDT Attend this webinar and master GMAT SC in 10 days by learning how meaning and logic can help you tackle 700+ level SC questions with ease. Apr 27 10:00 PM PDT  11:00 PM PDT Learn the best strategies for acing the Verbal section. From Sentence Correction tactics to 3 keys for solving Reading Comprehension questions and tips for Critical Reasoning questions. Video Premiere April 23rd at 8am PT Apr 28 07:00 AM PDT  09:00 AM PDT Attend this webinar to learn a structured approach to solve 700+ Number Properties question in less than 2 minutes.
Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 54401

Three hoses, x, y, and z, each pump water at a constant rate. How long
[#permalink]
Show Tags
18 Apr 2017, 03:49
Question Stats:
71% (00:59) correct 29% (00:56) wrong based on 138 sessions
HideShow timer Statistics
Three hoses, x, y, and z, each pump water at a constant rate. How long will it take the hoses to fill up a 30,000gallon tank? (1) Hose x pumps water at 3 times the speed of z. (2) Hose y pumps water at half the rate of x.
Official Answer and Stats are available only to registered users. Register/ Login.
_________________



Senior Manager
Joined: 24 Apr 2016
Posts: 331

Re: Three hoses, x, y, and z, each pump water at a constant rate. How long
[#permalink]
Show Tags
18 Apr 2017, 08:42
Three hoses, x, y, and z, each pump water at a constant rate. How long will it take the hoses to fill up a 30,000gallon tank?
We would need either the combined rate for hoses x,y & z to pump water or the individual rates for x, y & z
(1) Hose x pumps water at 3 times the speed of z.
This statement just gives the ratio of speeds of x and z. moreover it says nothing about y. Hence this statement is not sufficient.
(2) Hose y pumps water at half the rate of x.
This statement only talks about y and x and nothing about z. Also this statement just gives the ratio of speeds of x and y.Hence this statement is not sufficient.
Combining both statements also is not sufficient, as we only know the ratios but no actual value is given.
Answer is E



Manager
Joined: 11 Feb 2017
Posts: 188

Three hoses, x, y, and z, each pump water at a constant rate. How long
[#permalink]
Show Tags
24 Jul 2017, 03:05
Bunuel wrote: Three hoses, x, y, and z, each pump water at a constant rate. How long will it take the hoses to fill up a 30,000gallon tank? (1) Hose x pumps water at 3 times the speed of z. (2) Hose y pumps water at half the rate of x. If we make the equation 1/6x = x 1/2x = z 1/x = y 1/6x + 1/2x + 1/x = 1/30,000 Why cant be C be correct as we can solve to get X Please help



Intern
Joined: 19 Jan 2014
Posts: 35

Re: Three hoses, x, y, and z, each pump water at a constant rate. How long
[#permalink]
Show Tags
24 Jul 2017, 06:13
rocko911 wrote: Bunuel wrote: Three hoses, x, y, and z, each pump water at a constant rate. How long will it take the hoses to fill up a 30,000gallon tank? (1) Hose x pumps water at 3 times the speed of z. (2) Hose y pumps water at half the rate of x. If we make the equation 1/6x = x 1/2x = z 1/x = y 1/6x + 1/2x + 1/x = 1/30,000 Why cant be C be correct as we can solve to get X Please help Because the actual measurement of the rate is not given. The rate could be gallons/hour or gallons/sec or gallons/min. Unless we know the actual measurement, we cannot determine time taken to fill the tank.




Re: Three hoses, x, y, and z, each pump water at a constant rate. How long
[#permalink]
24 Jul 2017, 06:13






