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An empty tank has a capacity of 5000 litres. Two pipes A and B

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An empty tank has a capacity of 5000 litres. Two pipes A and B [#permalink]

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New post 07 Apr 2018, 02:54
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52% (00:40) correct 48% (00:52) wrong based on 23 sessions

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An empty tank has a capacity of 5000 litres. Two pipes A and B are opened simultaneously will the tank takes more than 500 minutes to fill?

(1) A can fill the tank at 5 litres/ min
(2) B can fill the tank at 10 litres/min


Source: Time4Education
[Reveal] Spoiler: OA

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Re: An empty tank has a capacity of 5000 litres. Two pipes A and B [#permalink]

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New post 07 Apr 2018, 03:36
Nixondutta wrote:
An empty tank has a capacity of 5000 litres. Two pipes A and B are opened simultaneously will the tank takes more than 500 minutes to fill?

(1) A can fill the tank at 5 litres/ min
(2) B can fill the tank at 10 litres/min


Source: Time4Education


5000 L is capacity. When both A & B are opened simul, will the tank take more than 500 mins to fill is the Q.

(1) A fills @ 5L/min ... so for 5000L -> A takes 1000 mins. Not suff as we do not know what is the rate of B with this info.

(2) B fills @ 10L/min ... so for 5000L -> B takes 500 mins. Sufficient! even if A is not used , the whole tank will not take more than 500 mins to fill up. So our answer is always "YES".

Hence Option (B) is our answer.

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Gladi
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Re: An empty tank has a capacity of 5000 litres. Two pipes A and B [#permalink]

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New post 07 Apr 2018, 08:26
Nixondutta wrote:
An empty tank has a capacity of 5000 litres. Two pipes A and B are opened simultaneously will the tank takes more than 500 minutes to fill?

(1) A can fill the tank at 5 litres/ min
(2) B can fill the tank at 10 litres/min


Source: Time4Education


I think the answer should be C because when each statement is taken alone, we do not know whether the other pipe is inward flowing or outward flowing. E.g. if we look at Statement 2 alone, we're given that B can fill tank at 10L/min but we're not told anything about A. What if A can drain tank at 10L/min?
Re: An empty tank has a capacity of 5000 litres. Two pipes A and B   [#permalink] 07 Apr 2018, 08:26
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An empty tank has a capacity of 5000 litres. Two pipes A and B

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