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

 It is currently 29 Jun 2015, 15:34

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

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Senior Manager
Joined: 29 Jun 2005
Posts: 403
Followers: 1

Kudos [?]: 15 [0], given: 0

John traveled 80% of the way from Yellow-town to [#permalink]  05 Apr 2006, 00:49
00:00

Difficulty:

(N/A)

Question Stats:

100% (02:55) correct 0% (00:00) wrong based on 1 sessions
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: 05 Feb 2006
Posts: 899
Followers: 1

Kudos [?]: 54 [0], given: 0

[#permalink]  05 Apr 2006, 01:29
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: 31

Kudos [?]: 127 [0], given: 0

[#permalink]  05 Apr 2006, 09:55
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: 5068
Location: Singapore
Followers: 23

Kudos [?]: 192 [0], given: 0

[#permalink]  06 Apr 2006, 00:11
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 [?]: 3 [0], given: 0

[#permalink]  06 Apr 2006, 07:13
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, 07:13
Similar topics Replies Last post
Similar
Topics:
1 On 3 sales John has received commissions of $240,$80, and \$ 4 10 Jan 2014, 06:06
1 John Travels from A to B which are 60 miles apart 5 29 Jun 2013, 17:40
7 A car traveled 75% of the way from town A to town B at an 12 27 Mar 2013, 06:21
3 A train travels from station A to station B. If it travels 6 16 Sep 2012, 01:48
It takes the same time for a ship to travel 80 miles 1 03 Nov 2006, 00:58
Display posts from previous: Sort by

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

 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®.