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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4809
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 123

Kudos [?]: 1975 , given: 397

Water flows into a 25-liter bucket through a hose and out [#permalink]
Expert's post 00:00

Question Stats: 75% (02:10) correct 25% (00:50) wrong based on 8 sessions
Water flows into a 25-liter bucket through a hose and out through a hole in the bottom of the bucket. The rate of flow through the hose is 1 liter per minute. If the bucket is filled to capacity in 40 minutes, at what rate, in liters per minute, was water flowing out of the bucket through the hole?

A. $$\frac{3}{8}$$
B. $$\frac{3}{5}$$
C. $$\frac{5}{8}$$
D. $$\frac{8}{5}$$
E. $$\frac{13}{8}$$

Drill 2
Question: 7
Page: 525
[Reveal] Spoiler: OA

_________________

Sandy
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Try our free Online GRE Test Director Joined: 20 Apr 2016
Posts: 948
WE: Engineering (Energy and Utilities)
Followers: 13

Kudos [?]: 709  , given: 152

Re: Water flows into a 25-liter bucket through a hose and out [#permalink]
1
KUDOS
sandy wrote:
Water flows into a 25-liter bucket through a hose and out through a hole in the bottom of the bucket. The rate of flow through the hose is 1 liter per minute. If the bucket is filled to capacity in 40 minutes, at what rate, in liters per minute, was water flowing out of the bucket through the hole?

A. $$\frac{3}{8}$$
B. $$\frac{3}{5}$$
C. $$\frac{5}{8}$$
D. $$\frac{8}{5}$$
E. $$\frac{13}{8}$$

Drill 2
Question: 7
Page: 525

We can solve the problem using the equation

A = R x T

Where A= 25 L

R (Total) = R (inlet) - R (outlet) (Since we have rate of water entering the bucket and the rate of water flowing out the bucket)

R (inlet) = 1 Litre/minute
R (outlet) = Let us assume as r Litre/minute

T = 40 minute

Therefore we have

25 = (1 - r) X 40

or $$\frac{25}{40}$$= 1 - r

or r = 1 - $$\frac{5}{8}$$

or r =$$\frac{3}{8}$$

Hence the rate at which the the water was flowing out is = $$\frac{3}{8}$$
_________________

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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4809
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 123

Kudos [?]: 1975 , given: 397

Re: Water flows into a 25-liter bucket through a hose and out [#permalink]
Expert's post
Explanation

Remember that amount = rate × time. So, 25 liters = rate × 40 minutes.

The rate was $$\frac{25}{40}=\frac{5}{8}$$ liters/min.

The net rate at which the bucket is filling is the difference between the hose’s rate and the leaking rate. So, (1 liter/min) – (leaking rate) = $$\frac{5}{8}$$.

Solve for the leaking rate to find the leaking rate is $$\frac{3}{8}$$liters/min; the answer is choice A.
_________________

Sandy
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Try our free Online GRE Test Re: Water flows into a 25-liter bucket through a hose and out   [#permalink] 29 Dec 2017, 13:59
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