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Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in

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Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

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New post 07 Jan 2019, 03:04
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (01:21) correct 21% (01:31) wrong based on 29 sessions

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Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill 2/3 of the tank?

A. 30
B. 48
C. 54
D. 60
E. 72

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Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

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New post Updated on: 08 Jan 2019, 00:47
2
Bunuel wrote:
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill of the tank?

A. 30
B. 48
C. 54
D. 60
E. 72


combined rate ' 1/3+1/2 = 5/6
time 6/5 * 60 = 72
2/3 * 72 = 48 mins IMO B

or say
180 mins and 120 mins

1/180 + 1/120 ; 5/360 ; 72 mins
2/3 * 72 = 48 mins IMO B
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Originally posted by Archit3110 on 07 Jan 2019, 03:15.
Last edited by Archit3110 on 08 Jan 2019, 00:47, edited 2 times in total.
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Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in  [#permalink]

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New post 08 Jan 2019, 00:43
Archit3110 wrote:
Bunuel wrote:
Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in 2 hours, how many minutes will it take both pipes to fill of the tank?

A. 30
B. 48
C. 54
D. 60
E. 72


Bunuel : answer choice given seems to be incorrect correct option should be e 72.


combined rate ' 1/3+1/2 = 5/6
time 6/5 * 60 = 72 IMO E

or say
180 mins and 120 mins

1/180 + 1/120 ; 5/360 ; 72 mins E ..


Sorry Archit. There was a copy/paste error. Corrected question reads: how many minutes will it take both pipes to fill 2/3 of the tank? Edited. Thank you.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
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Re: Pipe A can fill a tank in 3 hours. If pipe B can fill the same tank in &nbs [#permalink] 08 Jan 2019, 00:43
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