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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 ## At a constant speed of 72 kilometers per hour, a vehicle tagged by: swerve ##### This topic has 7 expert replies and 0 member replies ### Top Member ## At a constant speed of 72 kilometers per hour, a vehicle ## Timer 00:00 ## Your Answer A B C D E ## Global Stats Difficult At a constant speed of 72 kilometers per hour, a vehicle travels how many kilometers per second? A. 0.02 B. 0.2 C. 0.6 D. 1.2 E. 6.0 The OA is A Source: GMAT Paper Tests ### GMAT/MBA Expert Elite Legendary Member Joined 23 Jun 2013 Posted: 10197 messages Followed by: 497 members Upvotes: 2867 GMAT Score: 800 Hi All, We're told that a vehicles travels at a constant speed of 72 kilometers per HOUR. We're asked what that speed is in kilometers per SECOND. This question is really just about 'unit conversions', although at a certain point you can use the 'spread' of the answer choices to your advantage and stop doing 'math.' 1 hour = 60 minutes 1 minute = 60 seconds 1 hour = (60)(60) = 3600 seconds 72 km/3600 seconds Since 72/720 = .1, we know that 72/3600 is far LOWER than .1 There's only one answer that matches... Final Answer: A GMAT assassins aren't born, they're made, Rich _________________ Contact Rich at Rich.C@empowergmat.com ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2094 messages Followed by: 240 members Upvotes: 1443 Here's an easy way to set up UNIT CONVERSIONS - set it up as fractions, so that numerators and denominators of the same unit cancel: Now there's no confusion about whether to multiply or divide, etc. Now simplify: take a 6 out of each 60, and two 6's out of 72: We're left with 2 km every 100 sec, or 0.02 km/sec. The answer is A. _________________ Ceilidh Erickson Manhattan Prep GMAT & GRE instructor EdM in Mind, Brain, and Education Harvard Graduate School of Education Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience. Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2094 messages Followed by: 240 members Upvotes: 1443 _________________ Ceilidh Erickson Manhattan Prep GMAT & GRE instructor EdM in Mind, Brain, and Education Harvard Graduate School of Education Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience. Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. ### GMAT/MBA Expert GMAT Instructor Joined 09 Oct 2010 Posted: 1449 messages Followed by: 32 members Upvotes: 59 Hi, Ceilidh! I am glad to know the Manhattan also considers UNITS CONTROL as one of its prep tools. (You call it UNITS CONVERSIONS but we are talking about the very same thing!) As you have already realized in this forum, this is one of the most powerful (and used) tools we offer in the GMATH method. (We have extended the basic function it usually has to a WIDE diversity of GMAT situations!) Kind Regards, Fabio. _________________ Fabio Skilnik :: GMATH method creator ( Math for the GMAT) English-speakers :: https://www.gmath.net Portuguese-speakers :: https://www.gmath.com.br ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2094 messages Followed by: 240 members Upvotes: 1443 "Units Control" has a great space-age ring to it, like something you'd shout from the bridge on Star Trek! I like it. _________________ Ceilidh Erickson Manhattan Prep GMAT & GRE instructor EdM in Mind, Brain, and Education Harvard Graduate School of Education Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience. Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. ### GMAT/MBA Expert GMAT Instructor Joined 09 Oct 2010 Posted: 1449 messages Followed by: 32 members Upvotes: 59 ceilidh.erickson wrote: "Units Control" has a great space-age ring to it, like something you'd shout from the bridge on Star Trek! I like it. Love that, Ceilidh! I created the expression because "values follow units", in other words, the units themselves "take control"... Kind Regards, Fabio. _________________ Fabio Skilnik :: GMATH method creator ( Math for the GMAT) English-speakers :: https://www.gmath.net Portuguese-speakers :: https://www.gmath.com.br ### GMAT/MBA Expert GMAT Instructor Joined 25 Apr 2015 Posted: 2950 messages Followed by: 19 members Upvotes: 43 swerve wrote: At a constant speed of 72 kilometers per hour, a vehicle travels how many kilometers per second? A. 0.02 B. 0.2 C. 0.6 D. 1.2 E. 6.0 Since 1 hour = 3600 seconds, 72 km/hour = 72/3600 = 1/50 = 0.02 km/second. 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