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# A cistern has a leak which empty it in 8 hrs, A tap is turned on which

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Manager
Joined: 18 Apr 2019
Posts: 87
Location: India
GMAT 1: 720 Q48 V40
GPA: 4
Re: A cistern has a leak which empty it in 8 hrs, A tap is turned on which  [#permalink]

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11 Jul 2019, 03:02
1
I think all the explanations above capture the different ways of approaching the question beautifully.
I would just like to share an approach which is really helpful during a time crunch or when you can't figure out how to solve.

Cistern empties tank in 8hrs.
The capacity of tank = 8*time taken by cistern.
Hence, the answer must be a multiple of 8.
ONLY option A complies.

Always write down what the question tells you and then pause and think before digging in. A 10 sec pause might just save you a whole lot of trouble.
Senior Manager
Joined: 03 Sep 2018
Posts: 250
Location: Netherlands
GMAT 1: 710 Q48 V40
GMAT 2: 760 Q49 V44
GPA: 4
Re: A cistern has a leak which empty it in 8 hrs, A tap is turned on which  [#permalink]

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29 Sep 2019, 07:11
8*r=12*(r-360) –> r=360*3 –> 8*r=8640
_________________
Good luck to you. Retired from this forum.
Senior Manager
Joined: 03 Sep 2018
Posts: 250
Location: Netherlands
GMAT 1: 710 Q48 V40
GMAT 2: 760 Q49 V44
GPA: 4
Re: A cistern has a leak which empty it in 8 hrs, A tap is turned on which  [#permalink]

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29 Sep 2019, 07:11
Karmesh wrote:
I think all the explanations above capture the different ways of approaching the question beautifully.
I would just like to share an approach which is really helpful during a time crunch or when you can't figure out how to solve.

Cistern empties tank in 8hrs.
The capacity of tank = 8*time taken by cistern.
Hence, the answer must be a multiple of 8.
ONLY option A complies.

Always write down what the question tells you and then pause and think before digging in. A 10 sec pause might just save you a whole lot of trouble.

_________________
Good luck to you. Retired from this forum.
Manager
Joined: 07 Jan 2012
Posts: 62
GMAT Date: 04-30-2012
WE: Information Technology (Computer Software)
Re: A cistern has a leak which empty it in 8 hrs, A tap is turned on which  [#permalink]

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02 Dec 2019, 10:24
Confused - are the taps opened simultaneously? Also provide the source please
Re: A cistern has a leak which empty it in 8 hrs, A tap is turned on which   [#permalink] 02 Dec 2019, 10:24

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