Last visit was: 08 May 2026, 05:18 It is currently 08 May 2026, 05:18
Home
Messages
Tests
Schools
Events
Close
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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
Capthan
User avatar
Joined: 25 Feb 2008
Last visit: 07 Feb 2011
Posts: 45
Own Kudos:
76
Posts: 45
Kudos: 76
In a stream with a current of 5 kilometers per hour a boat 21 Mar 2008, 06:18
Kudos
Add Kudos
Bookmarks
Bookmark this Post
In a stream with a current of 5 kilometers per hour a boat made a trip downstream from point A to a point B and then back upstream from point B to point A. Measured in still water, the boat’s average speed for the trip was 15 kilometers per hour. Measured in the stream, what was the boat’s average speed for the trip in kilometers per hour?
16 2/3
15
14 ½
13 1/3
13
Please explain your answer.
Optional: time you spend on this question



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
prov
User avatar
Joined: 20 Aug 2007
Last visit: 13 Mar 2015
Posts: 33
Own Kudos:
36
 [1]
Posts: 33
Kudos: 36
 [1]
In a stream with a current of 5 kilometers per hour a boat 21 Mar 2008, 06:50
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Capthan
In a stream with a current of 5 kilometers per hour a boat made a trip downstream from point A to a point B and then back upstream from point B to point A. Measured in still water, the boat’s average speed for the trip was 15 kilometers per hour. Measured in the stream, what was the boat’s average speed for the trip in kilometers per hour?
16 2/3
15
14 ½
13 1/3
13
Please explain your answer.
Optional: time you spend on this question
Show more


Let distance from A to B = S
downstream speed = 15+5=20 .... time used = S/20
upstream speed = 15-5=10 .... time used = S/10

average speed = total distance/total time spend
=2S / (3S/20)
= 40/3
= 13 1/3


edit for typo



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!