Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 23 May 2017, 08:20

### GMAT Club Daily Prep

#### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Two water tanks, X and Y, were drained simultaneously. If X

Author Message
Manager
Joined: 03 Sep 2005
Posts: 135
Followers: 2

Kudos [?]: 5 [0], given: 0

Two water tanks, X and Y, were drained simultaneously. If X [#permalink]

### Show Tags

17 Sep 2005, 02:02
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Two water tanks, X and Y, were drained simultaneously. If X contained 30 more gallons of water than Y, and both tanks became empty at the same time, how long did it take the tanks to empty?

1) For ever gallon drained from tank Y, 2 gallons were drained from tank X.

2) Tank Y was drained at a constant rate of 20 gallons per hour.

Like they used to say in math class, please show your work! OA to come!
_________________

Life is not measured by the number of breaths you take, but by the number of moments that take your breath away.

Senior Manager
Joined: 22 Jun 2005
Posts: 363
Location: London
Followers: 1

Kudos [?]: 11 [0], given: 0

### Show Tags

17 Sep 2005, 04:28
I would pick C.

Let G be the volume in Y, which means we have G+30 in container X.

1) For ever gallon drained from tank Y, 2 gallons were drained from tank X.
Insufficient, need the rates.

2) Tank Y was drained at a constant rate of 20 gallons per hour.
Insuff, we need the rate for X.

1, 2 combined yields, the rate of Y is 20 gallon/hour
and the rate of X is 40gallon/hour

So,
The time it takes is the same for both to get empty.

G/20 =(G+30)/40 -> G=30

The time can now be calculated. 30/20=60/40=1.5 hour.
Current Student
Joined: 28 Dec 2004
Posts: 3363
Location: New York City
Schools: Wharton'11 HBS'12
Followers: 15

Kudos [?]: 297 [0], given: 2

### Show Tags

17 Sep 2005, 09:26
lets see..

X=y+30
y

so lets right the Workdone=Rate*time

y+30=rx*t

y=ry*t; where t is the same

(1) tells that rx=2ry

so

y+30=2ry*t
y=ry*t

solve simeltaneously...
30=ry*t

t=30/ry...we dont know ry...insuff

(2)
just tells ry...nothing else...insuff, we need to know the reltavitiy of y and x...

Combine...sufficient...
Senior Manager
Joined: 04 May 2005
Posts: 279
Location: CA, USA
Followers: 1

Kudos [?]: 56 [0], given: 0

### Show Tags

17 Sep 2005, 10:08
1) For ever gallon drained from tank Y, 2 gallons were drained from tank X.

2) Tank Y was drained at a constant rate of 20 gallons per hour.

from 1+2), we get Y drains at 20g/hr, X drains at 40g/hr
X drains 20g/hr faster

30 gallons more were drained from X, it takes 30/20 = 1.5 hours

so C
Senior Manager
Joined: 15 Aug 2005
Posts: 257
Location: Las Vegas, NV
Followers: 2

Kudos [?]: 4 [0], given: 0

### Show Tags

17 Sep 2005, 10:44
Got C as well.

Y = amount of water in Y
Y + 30 = amount of water in X

T = time for both to drain

Ry = rate of Y

Rx = rate of X

From Statement one you get

Rx = 2Ry

Set up the rate equations for both (Rate = amount/time), combine and you get

RyT = 30

Insufficient

From Statement two you just get the Ry, also insufficient.

Combine and you get T.

C.
Manager
Joined: 03 Sep 2005
Posts: 135
Followers: 2

Kudos [?]: 5 [0], given: 0

### Show Tags

17 Sep 2005, 16:22
Good job you guys!! OA is C. You guys are hella smart!
_________________

Life is not measured by the number of breaths you take, but by the number of moments that take your breath away.

17 Sep 2005, 16:22
Display posts from previous: Sort by