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

 It is currently 27 Mar 2015, 20:33

### 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 boat travels at the speed of 15 km/hr in still water.

Author Message
TAGS:
Senior Manager
Joined: 30 Aug 2003
Posts: 330
Location: BACARDIVILLE
Followers: 1

Kudos [?]: 1 [0], given: 0

A boat travels at the speed of 15 km/hr in still water. [#permalink]  16 Jan 2004, 13:35
A boat travels at the speed of 15 km/hr in still water. However, it will take three times as long for the boat to row up stream as to row downstream. What is the speed of the stream?

a. 5 kmph
b. 7.5
c. 9
d. 10
e. Cannot be determined
_________________

Pls include reasoning along with all answer posts.
****GMAT Loco****
Este examen me conduce jodiendo loco

Senior Manager
Joined: 30 Aug 2003
Posts: 325
Location: dallas , tx
Followers: 1

Kudos [?]: 8 [0], given: 0

Ans:7.5
sol:
rate upstream =x
downstream=3x

rate in still water =1/2(x+3x)=2xkm/hr
2x=15 ,x=7.5
so 3x=22.5
rate of stream=1/2(22.5-7.5)=7.5
_________________

shubhangi

Director
Joined: 13 Nov 2003
Posts: 794
Location: BULGARIA
Followers: 1

Kudos [?]: 25 [0], given: 0

I have a little bit different approach: X-speed of current
15-X/15+X=1/3
15+X=45-3X
4X=30
X=7,5
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4315
Followers: 25

Kudos [?]: 209 [0], given: 0

Nice BG. Or again, as PR relentlessly taught us, we can just backsolve and find it in 20 seconds
_________________

Best Regards,

Paul

Similar topics Replies Last post
Similar
Topics:
2 The speed of a boat in still water is 6 kmph. What is the speed of the 2 21 Jan 2015, 01:12
2 If a car moving at the speed of x km/hr travels a distance 5 29 Jun 2013, 20:27
A train always travels at one of two speeds: 160 km/hr in 19 08 Oct 2007, 10:55
Speed of still water 7 10 Jun 2005, 17:06
A train travels at an average speed of 90 km/hr without any 6 27 Apr 2005, 22:53
Display posts from previous: Sort by