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Fuel tanker A can fill the underground reservoir in 12 minutes. How

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Fuel tanker A can fill the underground reservoir in 12 minutes. How [#permalink]

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Fuel tanker A can fill the underground reservoir in 12 minutes. How long will it take fuel tanker A and fuel tanker B to fill up the same reservoir together?

(1) The reservoir contains 3000 liters of fuel.
(2) Fuel tanker B alone will require the same number of hours to fill the same reservoir.
[Reveal] Spoiler: OA

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Re: Fuel tanker A can fill the underground reservoir in 12 minutes. How [#permalink]

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Fuel tanker A can fill the underground reservoir in 12 minutes. How long will it take fuel tanker A and fuel tanker B to fill up the same reservoir together?

(1) The reservoir contains 3000 liters of fuel.
(2) Fuel tanker B alone will require the same number of hours to fill the same reservoir.

Statement 1) Does not specify the rate of Tanker B. Choice A) & C) ruled out.
Statement 2) Fuel tanker B fills the reservoir in the same no of hours as tanker A. (i assume the statement refers to Tanker A for comparison)
i.e A & B can independently fill the tanker in 12mins.
Together they will fill in 6mins.

Choice B) is correct. Statement 2) alone is sufficient to ans the question.

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Re: Fuel tanker A can fill the underground reservoir in 12 minutes. How [#permalink]

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New post 23 Jun 2016, 03:30
Bunuel wrote:
Fuel tanker A can fill the underground reservoir in 12 minutes. How long will it take fuel tanker A and fuel tanker B to fill up the same reservoir together?

(1) The reservoir contains 3000 liters of fuel.
(2) Fuel tanker B alone will require the same number of hours to fill the same reservoir.


Given: A can fill a reservoir in 12 miniyes
Required: How much time will A and B take together to fill the reservoir

Statement 1: The reservoir contains 3000 liters of fuel
No information about B
INSUFFICIENT

Statement 2: Fuel tanker B alone will require the same number of hours to fill the same reservoir
This means that B fills the reservoir in 12 minutes too.
Hence A and B will together fill it in half the time.
SUFFICIENT

Correct Option: B

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Fuel tanker A can fill the underground reservoir in 12 minutes. How [#permalink]

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New post 01 Aug 2016, 00:38
Bunuel wrote:
Fuel tanker A can fill the underground reservoir in 12 minutes. How long will it take fuel tanker A and fuel tanker B to fill up the same reservoir together?

(1) The reservoir contains 3000 liters of fuel.
(2) Fuel tanker B alone will require the same number of hours to fill the same reservoir.


(1) The reservoir contains 3000 liters of fuel.
Gives us the total volume and thus by calculation, the rate of A ; but provide us no info about B neither its rate nor time taken
INSUFFICIENT

(2) Fuel tanker B alone will require the same number of hours to fill the same reservoir
Tells us that time of A and B are same and thus by inverse their rate is same . they both will do equal work, no matter how much the volume of the underground reservoir is therefore the TOTAL time taken will always be half of time of A = 12/2 = 6 minutes.

SUFFICIENT

ANSWER IS B
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Re: Fuel tanker A can fill the underground reservoir in 12 minutes. How [#permalink]

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Re: Fuel tanker A can fill the underground reservoir in 12 minutes. How   [#permalink] 16 Nov 2017, 23:10
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