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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote Little Texas Drilling Company has three wells, each producin This topic has 2 expert replies and 1 member reply Top Member Little Texas Drilling Company has three wells, each producin Timer 00:00 Your Answer A B C D E Global Stats Difficult Little Texas Drilling Company has three wells, each producing oil at a constant rate. Well A produces one barrel every two minutes. Well B produces one barrel every three minutes. Well C produces one barrel every four minutes. How many hours does it take Little Texas Drilling Company to produce 165 barrels of oil? (A) 2 (B) 3 (C) 4 (D) 18 (E) 180 OA B Source: Magoosh GMAT/MBA Expert GMAT Instructor Joined 25 Apr 2015 Posted: 2950 messages Followed by: 19 members Upvotes: 43 Top Reply BTGmoderatorDC wrote: Little Texas Drilling Company has three wells, each producing oil at a constant rate. Well A produces one barrel every two minutes. Well B produces one barrel every three minutes. Well C produces one barrel every four minutes. How many hours does it take Little Texas Drilling Company to produce 165 barrels of oil? (A) 2 (B) 3 (C) 4 (D) 18 (E) 180 OA B Source: Magoosh If we let t = the time in minutes during which the wells work together, we can create the following equation to determine t: (1/2)t + (1/3)t + (1/4)t = 195 Multiplying the entire equation by 12, we have: 6t + 4t + 3t = 2340 13t = 2340 t = 2340/13 = 180 minutes, or 3 hours. Alternate solution: Since well A produces one barrel every two minutes, it can produce 30 barrels in an hour. Likewise, since well B produces one barrel every three minutes and well C produces one barrel every four minutes, they can produce 20 and 15 barrels an hour, respectively. Thus, in one hour, these 3 wells can produce 30 + 20 + 15 = 65 barrels. Thus, it takes them 195/65 = 3 hours to produce 195 barrels. Answer: B _________________ Scott Woodbury-Stewart Founder and CEO scott@targettestprep.com See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews Top Member Legendary Member Joined 29 Oct 2017 Posted: 1018 messages Followed by: 4 members Top Reply The three rates of production are 0.5 barrels/min , 0.33 barrels/min & 0.25 barrels/min. Let's consider the answer choices: The total number of barrels produced in A) 2 hrs = 60+40+30 = 130 B) 3 hrs = 90+60+45 = 195 Hence B GMAT/MBA Expert GMAT Instructor Joined 25 May 2010 Posted: 15387 messages Followed by: 1872 members Upvotes: 13060 GMAT Score: 790 Given the answer choices, the prompt should read as follows: BTGmoderatorDC wrote: Little Texas Drilling Company has three wells, each producing oil at a constant rate. Well A produces one barrel every two minutes. Well B produces one barrel every three minutes. Well C produces one barrel every four minutes. How many hours does it take Little Texas Drilling Company to produce 185 barrels of oil? (A) 2 (B) 3 (C) 4 (D) 18 (E) 180 A's rate = (1 barrel)/(2 minutes) * (60 minutes)/(1 hour) = 30 barrels per hour. B's rate = (1 barrel)/(3 minutes) * (60 minutes)/(1 hour) = 20 barrels per hour. C's rate = (1 barrel)/(15 minutes) * (60 minutes)/(1 hour) = 15 barrels per hour. Since the combined rate for A+B+C = 30+20+15 = 65 barrels per hour, the time to produce 185 barrels = w/r = 185/65 = 3 hours. The correct answer is B. _________________ Mitch Hunt Private Tutor for the GMAT and GRE GMATGuruNY@gmail.com If you find one of my posts helpful, please take a moment to click on the "UPVOTE" icon. Available for tutoring in NYC and long-distance. For more information, please email me at GMATGuruNY@gmail.com. Student Review #1 Student Review #2 Student Review #3 Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now. • Award-winning private GMAT tutoring Register now and save up to$200

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