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# A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaini

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Joined: 17 Oct 2016
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A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaini  [#permalink]

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16 Sep 2018, 03:30
1
00:00

Difficulty:

15% (low)

Question Stats:

79% (00:53) correct 21% (01:05) wrong based on 36 sessions

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A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaining (in hours) till the tank is completely filled?

A. 3

B. 3.5

C. 10.5

D. 7.5

E. 4.5

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Re: A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaini  [#permalink]

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16 Sep 2018, 03:40
fitzpratik wrote:
A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaining (in hours) till the tank is completely filled?

A. 3

B. 3.5

C. 10.5

D. 7.5

E. 4.5

2/7 of tank in 3 hour
so the remaining = 5/7 in 3*7/2 *5/7 = 7.5
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Re: A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaini  [#permalink]

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16 Sep 2018, 03:47
OA: D

Time taken to fill $$\frac{2}{7}$$ of tank : $$3$$ hours

Time taken to fill $$1$$ tank $$= \frac{7}{2}*3 \quad$$hours $$= \frac{21}{2}$$ hours

The time remaining (in hours) till the tank is completely filled $$= (\frac{21}{2} - 3)$$ Hours $$=\frac{21-6}{2}$$ Hours $$= \frac{15}{2}$$ Hours $$= 7.5$$ Hours
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Re: A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaini  [#permalink]

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16 Sep 2018, 04:57
fitzpratik wrote:
A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaining (in hours) till the tank is completely filled?

A. 3

B. 3.5

C. 10.5

D. 7.5

E. 4.5

3 = 2/7
x = 5/7

cross multiply
x = 7.5
Re: A pipe takes 3 hours to fill (2/7) of a tank. What is the time remaini   [#permalink] 16 Sep 2018, 04:57
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