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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 ## m and n are both positive. Pump A pumps n liters of water tagged by: M7MBA ##### This topic has 1 expert reply and 0 member replies ## m and n are both positive. Pump A pumps n liters of water m and n are both positive. Pump A pumps n liters of water per minute, and pump B pumps m liters of water per minute. Is m < n ? (1) x is the number of minutes it takes pump B to fill a 100 liter container alone, and 3x is the number of minutes it takes pump B to fill a 100 liter container while pump A pumps water out of that container. (2) It takes (3x/2) minutes for pump A to fill a 100 liter container alone. The OA is the option A. Any expert may explain to me how to show that statement (1) is sufficient? I'm really confused here. ### GMAT/MBA Expert Legendary Member Joined 14 Jan 2015 Posted: 2667 messages Followed by: 122 members Upvotes: 1153 GMAT Score: 770 Top Reply M7MBA wrote: m and n are both positive. Pump A pumps n liters of water per minute, and pump B pumps m liters of water per minute. Is m < n ? (1) x is the number of minutes it takes pump B to fill a 100 liter container alone, and 3x is the number of minutes it takes pump B to fill a 100 liter container while pump A pumps water out of that container. (2) It takes (3x/2) minutes for pump A to fill a 100 liter container alone. The OA is the option A. Any expert may explain to me how to show that statement (1) is sufficient? I'm really confused here. Statement 1: No need to do any math here. Use a little logic. If B is pumping water into a container while A is pumping water out of the container, in order for that container to ever be filled, B has to be faster. Otherwise, A would empty out everything B pumps in! So the fact that the container fills means B must be faster than A. Sufficient. Statement 2: Nothing about pump B. No Good. The answer is A _________________ Veritas Prep | GMAT Instructor Veritas Prep Reviews Save$100 off any live Veritas Prep GMAT Course

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