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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 ## If two projectiles are launched at the same moment from... tagged by: BTGmoderatorLU ##### This topic has 2 expert replies and 0 member replies ### Top Member ## If two projectiles are launched at the same moment from... If two projectiles are launched at the same moment from 1320 miles apart and travel directly towards each other at 480 miles per hour and 510 miles per hour, respectively, how many minutes will it take for them to meet? A. 40 B. 44 C. 80 D. 88 E. 90 The OA is C. I'm really confused by this PS question. Experts, any suggestion, please? Thanks in advance. ### GMAT/MBA Expert Senior | Next Rank: 100 Posts Joined 16 Dec 2014 Posted: 94 messages Followed by: 4 members Upvotes: 2 GMAT Score: 770 LUANDATO wrote: If two projectiles are launched at the same moment from 1320 miles apart and travel directly towards each other at 480 miles per hour and 510 miles per hour, respectively, how many minutes will it take for them to meet? A. 40 B. 44 C. 80 D. 88 E. 90 The OA is C. I'm really confused by this PS question. Experts, any suggestion, please? Thanks in advance. Time = Distance / Speed Here the speed we need to use is 990 (480 + 510) as the objects are travelling towards each other. Time = 1320/990 Time = 1 1/3 Time = 80 min Answer is C. ### GMAT/MBA Expert Elite Legendary Member Joined 23 Jun 2013 Posted: 9942 messages Followed by: 492 members Upvotes: 2867 GMAT Score: 800 Hi LUANDATO, We're that two projectiles are launched at the same moment from 1320 miles apart and travel directly towards each other at 480 miles per hour and 510 miles per hour, respectively. We're asked for the number of minutes it will take for them to meet. The math behind this question can be done in number of different ways, depending on how you organize your work. To start, it's worth noting that all of the answers are INTEGERS, so even though the numbers in this question might seem 'big'/'strange', they clearly end with a whole number once you do the necessary work (implying that there IS some sort of 'relationship' among these numbers). Since the two projectiles are traveling 480 miles/hour and 510 miles/hour, their COMBINED rate is 480 + 510 = 990 miles/hour. The total distance traveled is 1320 miles - and that distance is larger than the combined speed in miles/hour, so the total time is clearly MORE than 1 hour. In that first hour, 990 miles are traveled, which would leave.... 1320 - 990 = 330 miles to go 330/990 = an extra 1/3 of an hour to travel the remaining distance, so the total time is 1 1/3 hours = 1 hour 20 minutes Final Answer: C GMAT assassins aren't born, they're made, Rich _________________ Contact Rich at Rich.C@empowergmat.com • FREE GMAT Exam Know how you'd score today for$0

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