It is currently 14 Dec 2017, 16:51

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# An ant walks an average of 500 meters in 12 minutes. A beetle walks 15

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 42607

Kudos [?]: 135661 [0], given: 12705

An ant walks an average of 500 meters in 12 minutes. A beetle walks 15 [#permalink]

### Show Tags

11 Jul 2016, 11:30
Expert's post
2
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

81% (01:31) correct 19% (02:10) wrong based on 118 sessions

### HideShow timer Statistics

An ant walks an average of 500 meters in 12 minutes. A beetle walks 15% less distance at the same time on the average. Assuming the beetle walks at her regular rate, what is its speed in km/h?

A. 2.125
B. 2.5
C. 2.775
D. 3.2
E. 3.5
[Reveal] Spoiler: OA

_________________

Kudos [?]: 135661 [0], given: 12705

Manager
Joined: 03 Apr 2016
Posts: 103

Kudos [?]: 17 [1], given: 31

Location: India
Concentration: Operations, General Management
GMAT 1: 720 Q50 V37
WE: Analyst (Computer Software)
Re: An ant walks an average of 500 meters in 12 minutes. A beetle walks 15 [#permalink]

### Show Tags

11 Jul 2016, 13:19
1
KUDOS
Y am I getting 2.125 ?.. not even in the options.

Sent from my SM-N910H using Tapatalk

Kudos [?]: 17 [1], given: 31

Senior Manager
Joined: 20 Feb 2015
Posts: 388

Kudos [?]: 107 [1], given: 10

Concentration: Strategy, General Management
Re: An ant walks an average of 500 meters in 12 minutes. A beetle walks 15 [#permalink]

### Show Tags

11 Jul 2016, 23:05
1
KUDOS
shashanksagar wrote:
Y am I getting 2.125 ?.. not even in the options.

Sent from my SM-N910H using Tapatalk

the ant walks an average of 500 meters in 12 minutes
or,
500 meters in 1/5 hours

the beetle walks 15% less distance = 500-75=425 meters in 12 minutes
or,
0.425 km in 12/60 = 1/5 hours

speed = 0.425*5 = 2.125 km/h

I guess option A should be 2.125

Kudos [?]: 107 [1], given: 10

Intern
Joined: 08 Jul 2017
Posts: 18

Kudos [?]: 2 [1], given: 3

Re: An ant walks an average of 500 meters in 12 minutes. A beetle walks 15 [#permalink]

### Show Tags

22 Oct 2017, 06:54
1
KUDOS
I did a bit of dimensional analysis initially.

(500m/12 min) * (60 min/1hr) * (1km/1000m) = 5km/2hr = 2.5km/hr.

Remember that the answers are increasing in rates. Given that the beetle must be walking slower than 2.5km/hr and there is only one answer with a lower rate than 2.5km/hr, (Answer choice A) that one must be the answer.

If you had to solve for it, since we know the beetle's speed is 15% less (10% + 5%), just determine 15% and subtract from 2.5km/hr. 10% of 2.5 = 0.25,and half of that is 0.125.

Then we're looking at [2.5 - (0.25 + .125)] or (2.5 - 0.375) = 2.125 which should be the answer, but maybe it's a typo?

Kudos [?]: 2 [1], given: 3

VP
Joined: 22 May 2016
Posts: 1131

Kudos [?]: 402 [1], given: 645

Re: An ant walks an average of 500 meters in 12 minutes. A beetle walks 15 [#permalink]

### Show Tags

22 Oct 2017, 08:23
1
KUDOS
Bunuel wrote:
An ant walks an average of 500 meters in 12 minutes. A beetle walks 15% less distance at the same time on the average. Assuming the beetle walks at her regular rate, what is its speed in km/h?

A. 2.215.
B. 2.5.
C. 2.775.
D. 3.2.
E. 3.5.

Bunuel , I, too, calculate the answer as 2.125 km/hr. I think there might be a typo in answer A.

Ant: $$\frac{500m}{12min}$$

Beetle walks 15 percent less distance in same time. (500 * .85 ) = 425 m

Beetle: $$\frac{425m}{12min} *\frac{60min}{1hr}* \frac{1km}{1000m}$$ =

$$\frac{425}{200}$$ = 2.125 km/hr

Kudos [?]: 402 [1], given: 645

Math Expert
Joined: 02 Sep 2009
Posts: 42607

Kudos [?]: 135661 [1], given: 12705

Re: An ant walks an average of 500 meters in 12 minutes. A beetle walks 15 [#permalink]

### Show Tags

23 Oct 2017, 00:18
1
KUDOS
Expert's post
genxer123 wrote:
Bunuel wrote:
An ant walks an average of 500 meters in 12 minutes. A beetle walks 15% less distance at the same time on the average. Assuming the beetle walks at her regular rate, what is its speed in km/h?

A. 2.215.
B. 2.5.
C. 2.775.
D. 3.2.
E. 3.5.

Bunuel , I, too, calculate the answer as 2.125 km/hr. I think there might be a typo in answer A.

Ant: $$\frac{500m}{12min}$$

Beetle walks 15 percent less distance in same time. (500 * .85 ) = 425 m

Beetle: $$\frac{425m}{12min} *\frac{60min}{1hr}* \frac{1km}{1000m}$$ =

$$\frac{425}{200}$$ = 2.125 km/hr

Typo edited. Thank you all.
_________________

Kudos [?]: 135661 [1], given: 12705

Target Test Prep Representative
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 1804

Kudos [?]: 981 [0], given: 5

Re: An ant walks an average of 500 meters in 12 minutes. A beetle walks 15 [#permalink]

### Show Tags

26 Oct 2017, 14:30
Bunuel wrote:
An ant walks an average of 500 meters in 12 minutes. A beetle walks 15% less distance at the same time on the average. Assuming the beetle walks at her regular rate, what is its speed in km/h?

A. 2.125
B. 2.5
C. 2.775
D. 3.2
E. 3.5

The rate of the beetle in meters per minute is (0.85 x 500)/12 = 425/12.

Since 1 hour = 60 minutes and 1 km = 1000 meters, the rate in km per hour is:

425/12 x 60 / 1000 = 425 x 5 / 1000 = 2.125

_________________

Jeffery Miller

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

Kudos [?]: 981 [0], given: 5

Re: An ant walks an average of 500 meters in 12 minutes. A beetle walks 15   [#permalink] 26 Oct 2017, 14:30
Display posts from previous: Sort by