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Math Expert
Joined: 02 Sep 2009
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Three hoses, x, y, and z, each pump water at a constant rate into a 70
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16 Jan 2017, 09:36
Question Stats:
89% (00:57) correct 11% (01:24) wrong based on 161 sessions
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Three hoses, x, y, and z, each pump water at a constant rate into a 70,000gallon tank. How long will it take the hoses to fill the tank up to the 30,000gallon mark? (1) The 3 hoses working simultaneously can fill half the tank in 5 hours. (2) Hose y pumps water at half the rate of x.
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Intern
Joined: 26 Oct 2016
Posts: 5

Re: Three hoses, x, y, and z, each pump water at a constant rate into a 70
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16 Jan 2017, 15:58
I say A.
From A you can derive that the total time is 10 hours because the rates are constant. Since W=R*T, we can figure out that the hoses work at a rate of 7000 gallons per hour. From there, you can figure out the time to get to 30000 gallons (but shouldn't go all the way  save time on the actual test). We don't need to worry about the individual rates so long as we know the combined rate, which we do here.
B only tells you about hoses X and Y, doesn't mention anything about Z. That won't work.



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Joined: 26 Mar 2013
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Re: Three hoses, x, y, and z, each pump water at a constant rate into a 70
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17 Jan 2017, 15:58
Three hoses, x, y, and z, each pump water at a constant rate into a 70,000gallon tank. How long will it take the hoses to fill the tank up to the 30,000gallon mark? (1) The 3 hoses working simultaneously can fill half the tank in 5 hours.
3 hoses takes 10 hrs to fill out the whole tank. It means to we can fill 30000/70000=3/7 in (3/7*10= 4 2/7) hrs
Sufficient
(2) Hose y pumps water at half the rate of x.
No info about z. Insufficient
Answer: A



Manager
Joined: 24 Jul 2016
Posts: 50

Re: Three hoses, x, y, and z, each pump water at a constant rate into a 70
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14 Jul 2017, 01:20
Bunuel wrote: Three hoses, x, y, and z, each pump water at a constant rate into a 70,000gallon tank. How long will it take the hoses to fill the tank up to the 30,000gallon mark? (1) The 3 hoses working simultaneously can fill half the tank in 5 hours. (2) Hose y pumps water at half the rate of x. i think the qn should have mentioned all the hoses running simultaneously.



Manager
Status: IF YOU CAN DREAM IT, YOU CAN DO IT
Joined: 03 Jul 2017
Posts: 187
Location: India
Concentration: Finance, International Business

Re: Three hoses, x, y, and z, each pump water at a constant rate into a 70
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07 Aug 2017, 23:52
If the time take to fill half of the tank is 5 hours, that means to fill 35000 gallons its going to take 5 hours. Therefore to fill 30000 gallons , we can find the time by cross multiplying. So sufficient
Statement 2 tells us only about the rate of y and x . So therefore NS. Answer is A



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Joined: 15 Jan 2019
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Re: Three hoses, x, y, and z, each pump water at a constant rate into a 70
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06 Mar 2019, 10:36
Answer should be E since there should be communication before filling is it empty or somewhat filled?




Re: Three hoses, x, y, and z, each pump water at a constant rate into a 70
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06 Mar 2019, 10:36






