Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 25 May 2016, 14:57

### 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

# If a car went the first third of the distance at 80 kmh, the

Author Message
TAGS:

### Hide Tags

Manager
Joined: 22 Jun 2010
Posts: 57
Followers: 1

Kudos [?]: 34 [0], given: 10

If a car went the first third of the distance at 80 kmh, the [#permalink]

### Show Tags

05 Oct 2010, 12:20
1
This post was
BOOKMARKED
00:00

Difficulty:

55% (hard)

Question Stats:

67% (03:17) correct 33% (02:42) wrong based on 96 sessions

### HideShow timer Statistics

If a car went the first third of the distance at 80 kmh, the second third at 24 kmh, and the last third at 48 kmh, what was the average speed of the car for the entire trip?

A. 36 kmh
B. 40 kmh
C. 42 kmh
D. 44 kmh
E. 50 kmh

(C) 2008 GMAT Club - m15#32
[Reveal] Spoiler: OA
Math Expert
Joined: 02 Sep 2009
Posts: 32992
Followers: 5751

Kudos [?]: 70476 [1] , given: 9847

Re: GMAT club Test m15#32 [#permalink]

### Show Tags

05 Oct 2010, 12:41
1
KUDOS
Expert's post
1
This post was
BOOKMARKED
AndreG wrote:
If a car went the first third of the distance at 80 kmh, the second third at 24 kmh, and the last third at 48 kmh, what was the average speed of the car for the entire trip?

(C) 2008 GMAT Club - m15#32

* 36 kmh
* 40 kmh
* 42 kmh
* 44 kmh
* 50 kmh

$$Average \ speed=\frac{total \ distance}{total \ time}$$, let the total distance be $$3x$$, then: $$total \ time=\frac{x}{80}+\frac{x}{24}+\frac{x}{48}=\frac{18x}{240}$$;

$$Average \ speed=\frac{total \ distance}{total \ time}=\frac{3x}{\frac{18x}{240}}=\frac{240*3}{18}=40$$.

_________________
Manager
Joined: 22 Jun 2010
Posts: 57
Followers: 1

Kudos [?]: 34 [0], given: 10

Re: GMAT club Test m15#32 [#permalink]

### Show Tags

05 Oct 2010, 12:44
Thanks! I confused distance with time and just couldnt wrap my head around where I went wrong
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 9623
Followers: 465

Kudos [?]: 120 [0], given: 0

Re: If a car went the first third of the distance at 80 kmh, the [#permalink]

### Show Tags

05 Oct 2014, 10:27
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Manager
Joined: 03 Jan 2015
Posts: 68
Concentration: Strategy, Marketing
WE: Research (Pharmaceuticals and Biotech)
Followers: 2

Kudos [?]: 22 [0], given: 224

Re: If a car went the first third of the distance at 80 kmh, the [#permalink]

### Show Tags

27 Jan 2015, 20:33
If a car went the first third of the distance at 80 kmh, the second third at 24 kmh, and the last third at 48 kmh, what was the average speed of the car for the entire trip?

A. 36 kmh
B. 40 kmh
C. 42 kmh
D. 44 kmh
E. 50 kmh

SOLUTION:

Assume D/3 = 240 (this number is convenient because it is divisible by 80, 24 and 48)

So:
240 = 80*T1 = 3 hrs
240 = 24*T2 = 10 hrs
240 = 48*T3 = 5 hrs

T = T1 + T2 + T3 = 18 hrs

D = RT
(240*3) = R*18
R = 40

Re: If a car went the first third of the distance at 80 kmh, the   [#permalink] 27 Jan 2015, 20:33
Similar topics Replies Last post
Similar
Topics:
1 David travels one-third of the distance from LA to SF at a s 4 08 Apr 2014, 08:24
9 A car travelled the first quarter of a certain distance at 9 18 Mar 2013, 07:52
21 If the first, third and thirteenth terms of an arithmetic 13 18 Aug 2012, 13:39
24 The second, the first and the third term of an AP whose comm 17 08 Dec 2011, 08:15
7 If a car went the first third of the distance at 80 kmh, the 12 08 Sep 2010, 23:29
Display posts from previous: Sort by