Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

working together at their constant rates , A and B can fill [#permalink]
18 Jul 2008, 05:08

1

This post was BOOKMARKED

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.

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$$.

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

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$$.

"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$$.

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$$.

Hey everyone, today’s post focuses on the interview process. As I get ready for interviews at Kellogg and Tuck (and TheEngineerMBA ramps up for his HBS... ...

I couldn’t help myself but stay impressed. young leader who can now basically speak Chinese and handle things alone (I’m Korean Canadian by the way, so...