Jemma takes 2 hours to swim the 4 miles from buoy A to

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swerve: Legendary Member; Posts: 2499; Joined: Sun Oct 29, 2017 2:04 pm; Followed by:6 members

Jemma takes 2 hours to swim the 4 miles from buoy A to

by swerve » Fri May 18, 2018 10:13 am

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Jemma takes 2 hours to swim the 4 miles from buoy A to buoy B. Tired from her swim, she then continues to buoy C at half her previous speed. If buoy C is 6 miles away from buoy B, how many more hours will pass before Jemma reaches Buoy C?

A. 4
B. 5
C. 6
D. 7
E. 8

The OA is C.

Please, can anyone explain this PS question? I can't get the correct answer. I need help. Thanks.

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Source: Beat The GMAT — Problem Solving | Fri May 18, 2018 10:13 am

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[email protected]: Elite Legendary Member; Posts: 10392; Joined: Sun Jun 23, 2013 6:38 pm; Location: Palo Alto, CA; Thanked: 2867 times; Followed by:511 members; GMAT Score:800

by [email protected] » Fri May 18, 2018 10:17 am

Hi swerve,

We're told that Jemma takes 2 hours to swim the 4 miles from buoy A to buoy B and then continues to buoy C at HALF her previous speed. If buoy C is 6 miles away from buoy B, we're asked how many MORE hours will pass before Jemma reaches Buoy C. This question is just a 'Rate' question - and you can solve it with some basic Arithmetic.

Since Jemma took 2 hours to swim the first 4 miles, she swam at 2 miles/hour. We're told that this rate is then cut in HALF for the next part of her swim - so she is then swimming at 1 mile/hour. Over the course of the next 6 miles at THAT speed, she would need 6 hours to swim that distance.

Final Answer: C

GMAT assassins aren't born, they're made,
Rich

Contact Rich at [email protected]

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8086; Joined: Sat Apr 25, 2015 10:56 am; Location: Los Angeles, CA; Thanked: 43 times; Followed by:29 members

by Scott@TargetTestPrep » Tue May 22, 2018 5:18 pm

swerve wrote:Jemma takes 2 hours to swim the 4 miles from buoy A to buoy B. Tired from her swim, she then continues to buoy C at half her previous speed. If buoy C is 6 miles away from buoy B, how many more hours will pass before Jemma reaches Buoy C?

A. 4
B. 5
C. 6
D. 7
E. 8

Jemma's initial speed, from A to B, is 2 mph. Her speed from B to C is 1 mph, so it takes her 6 hours to swim to buoy C.

Answer: C

Scott Woodbury-Stewart
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