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# working together at their constant rates , A and B can fill

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Joined: 11 May 2008
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working together at their constant rates , A and B can fill [#permalink]  18 Jul 2008, 05:08
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working together at their constant rates , A and B can fill an empty tank to capacity in1/2 hr.what is the constant rate of pump B?
1) A's constant rate is 25LTS / min
2) the tanks capacity is 1200 lts.

Last edited by arjtryarjtry on 18 Jul 2008, 07:08, edited 2 times in total.
SVP
Joined: 30 Apr 2008
Posts: 1888
Location: Oklahoma City
Schools: Hard Knocks
Followers: 38

Kudos [?]: 496 [0], given: 32

Re: time and work [#permalink]  18 Jul 2008, 05:18
C

1) we don't know the tanks capacity. We know the speed of a, but we can't figure how quickly A can fill it alone without the capacity.

2) We don't know the speed of either pump. The trick here is to forget the information from (1) and only use the info for (2) otherwise we'll likley answer B, when it should be C.

(Together) We can figure out how quickly A can fill the tank (48 minutes) and then from that we can figure out how fast B must be in order to make A + B = 30 minutes (or 2400 litres an hour)

arjtryarjtry wrote:
working together at their constant rates , A and B can fill an empty tank to capacity in1/2 hr.what is the constant rate of pump B?
1) A's constant rate is 25LTS / min
2) the tanks capacity is 1200 lts.

_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$. GMAT Club Premium Membership - big benefits and savings Director Joined: 14 Aug 2007 Posts: 733 Followers: 8 Kudos [?]: 139 [0], given: 0 Re: time and work [#permalink] 18 Jul 2008, 05:30 arjtryarjtry wrote: working together at their constant rates , A and B can fill an empty tank to capacity in1/2 hr.what is the constant rate of pump B? 1) A's constant rate is 25LTS / min 2) the tanks capacity is 1200 lts. C for me (A+B)* 30 mins = X litres of water...(X) 1) A is 25 Lts/ min, in 1/2 hr A alone will fill the tank with 25 * 30 = 750 ltrs of water (X) leaves is with 2 unknowns, X and A...insuff 2) (A+B)* 30 mins = 1200 litres of water A + B = 40 lts/min two unknowns, A & B, insuff Together 25 + B = 40 B = 15 lts/min suff SVP Joined: 30 Apr 2008 Posts: 1888 Location: Oklahoma City Schools: Hard Knocks Followers: 38 Kudos [?]: 496 [0], given: 32 Re: time and work [#permalink] 18 Jul 2008, 05:35 Showoff! Going through and actually solving the problem. I guess I'm just too lazy! LOL Nice work alpha...as usual. alpha_plus_gamma wrote: arjtryarjtry wrote: working together at their constant rates , A and B can fill an empty tank to capacity in1/2 hr.what is the constant rate of pump B? 1) A's constant rate is 25LTS / min 2) the tanks capacity is 1200 lts. C for me (A+B)* 30 mins = X litres of water...(X) 1) A is 25 Lts/ min, in 1/2 hr A alone will fill the tank with 25 * 30 = 750 ltrs of water (X) leaves is with 2 unknowns, X and A...insuff 2) (A+B)* 30 mins = 1200 litres of water A + B = 40 lts/min two unknowns, A & B, insuff Together 25 + B = 40 B = 15 lts/min suff _________________ ------------------------------------ J Allen Morris **I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

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SVP
Joined: 30 Apr 2008
Posts: 1888
Location: Oklahoma City
Schools: Hard Knocks
Followers: 38

Kudos [?]: 496 [0], given: 32

Re: time and work [#permalink]  18 Jul 2008, 05:47
"Showoff" is slang for when someone is good at something and everyone else knows it, that person does something just so others can see them do it. It can sometimes be a bad thing, but I mean it as a joke. You're very good at quant and I am teasing you because you went through the problem and solved for B where I just stopped when I saw it could be solved and didn't bother going all the way.

I hope I didn't offend you. I sometimes forget that many people on here are non-native English speakers. So many people that have English as a second language write very well and I forget that some slang can easily be misunderstood.

alpha_plus_gamma wrote:
jallenmorris wrote:
Showoff!

What do u mean?

_________________

------------------------------------
J Allen Morris
**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$. GMAT Club Premium Membership - big benefits and savings Director Joined: 14 Aug 2007 Posts: 733 Followers: 8 Kudos [?]: 139 [0], given: 0 Re: time and work [#permalink] 18 Jul 2008, 06:05 jallenmorris wrote: "Showoff" is slang for when someone is good at something and everyone else knows it, that person does something just so others can see them do it. Can you give me a reliable link that uses "showoff" with the above meaning? SVP Joined: 30 Apr 2008 Posts: 1888 Location: Oklahoma City Schools: Hard Knocks Followers: 38 Kudos [?]: 496 [0], given: 32 Re: time and work [#permalink] 18 Jul 2008, 06:29 http://www.wordwebonline.com/en/SHOWOFF Please remember that I intended this as a joke, and was having fun. Sometimes people will use the term "show off" to refer to someone they don't like or is acting in a way they don't like. I was using it in a teasing manner. _________________ ------------------------------------ J Allen Morris **I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

GMAT Club Premium Membership - big benefits and savings

Re: time and work   [#permalink] 18 Jul 2008, 06:29
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# working together at their constant rates , A and B can fill

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