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

 It is currently 25 Sep 2016, 23:17

### 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
Your Progress

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

# John traveled 80% of the way from Yellow-town to

 post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Senior Manager
Joined: 29 Jun 2005
Posts: 403
Followers: 2

Kudos [?]: 21 [0], given: 0

John traveled 80% of the way from Yellow-town to [#permalink]

### Show Tags

05 Apr 2006, 01:49
00:00

Difficulty:

(N/A)

Question Stats:

100% (02:55) correct 0% (00:00) wrong based on 1 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

John traveled 80% of the way from Yellow-town to Green-fields by train at an average speed of 80 miles per hour. The rest of the way John traveled by car at an average speed of v miles per hour. If the average speed for the entire trip was 60 miles per hour, what is v in miles per hour?

(a) 30
(b) 40
(c) 50
(d) 55
(e) 70
Director
Joined: 06 Feb 2006
Posts: 898
Followers: 2

Kudos [?]: 102 [0], given: 0

[#permalink]

### Show Tags

05 Apr 2006, 02:29
The average speed for the entire trip= Total distance/Total time

60/60=D/T

D/T=1

Pick 100 km for D...
This would yield T=100 minutes

Using the question stem we calculate 80 km were traveled in 1h (or 60 minutes)....

This leaves us with 40 minutes (2/3 of an hour) to travel 20km.....

R*T=D

R*2/3=20

R=30

Answer A....
Manager
Joined: 24 Oct 2005
Posts: 169
Followers: 34

Kudos [?]: 168 [0], given: 0

[#permalink]

### Show Tags

05 Apr 2006, 10:55
A.

Let "100" be the total distance travel (D). Thus, D1 = 80 and D2 = 20.
V1 = 80 mph, V2 is the unknown, and total velocity (V) = 60 mph.

D1/V1 + D2/V2 = D/V

80/80 + 20/V2 = 100/60

20/V2 = 2/3

20 (3/2) = V2

30 = V2
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5062
Location: Singapore
Followers: 30

Kudos [?]: 329 [0], given: 0

[#permalink]

### Show Tags

06 Apr 2006, 01:11
let total distance be d

First part by train took 0.8d/80 = 0.01 hour
Last part of journey took 0.2d/v hours

average speed = 80dv/(0.8vd + 16d) = 60
80vd = 48vd + 960d
32vd = 960
vd = 30d
v = 30
Senior Manager
Joined: 24 Jan 2006
Posts: 252
Followers: 1

Kudos [?]: 4 [0], given: 0

[#permalink]

### Show Tags

06 Apr 2006, 08:13
A 30 m/hr

if we consider total distance to be x and time taken as t.

(0.8x/80)+(0.2x)/v = (x/60)
=> v = 30
[#permalink] 06 Apr 2006, 08:13
Display posts from previous: Sort by

# John traveled 80% of the way from Yellow-town to

 post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.