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

 It is currently 29 Mar 2015, 05:43

### 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

# A train travels from a station B to station C using path P,

Author Message
TAGS:
Manager
Joined: 04 Dec 2005
Posts: 79
Followers: 1

Kudos [?]: 2 [0], given: 0

A train travels from a station B to station C using path P, [#permalink]  17 Jan 2007, 12:45
A train travels from a station B to station C using path P, while it returns using a different path. If the average speed on path P is 60km/hr, what is the average speed for the round trip?
1) The average speed on the back trip is 2/3 of the average speed on path P
2) The path P is 1/3 times longer than that of the back route.
Senior Manager
Joined: 24 Oct 2006
Posts: 339
Followers: 1

Kudos [?]: 16 [0], given: 0

Avg speed =total dist d/total time t

speed s of p=60

S1:s of back trip b=2/3 of p=40
since we can't find t and d - insuff

S2:d of p=4x/3 where x = d of b
t of p=d/s=(4x/3)/60=x/45
since we do not any other details about b - inuff

Together:
t of b=x/40
total d=x+(4x/3)=7x/3
total t=(x/40)+(x/45)
Since we can calculate total t and total d - suff

My ans is C
Senior Manager
Joined: 19 Jul 2006
Posts: 361
Followers: 1

Kudos [?]: 3 [0], given: 0

C .. agree with sumithra
Display posts from previous: Sort by