GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

It is currently 23 Feb 2020, 00:35

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.

Close

Request Expert Reply

Confirm Cancel

A boat takes a total of 6 hours to row 8 kms downstream and to return

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 61396
A boat takes a total of 6 hours to row 8 kms downstream and to return  [#permalink]

Show Tags

New post 06 Jan 2020, 06:21
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

57% (01:39) correct 43% (02:44) wrong based on 7 sessions

HideShow timer Statistics

Intern
Intern
avatar
B
Joined: 23 Sep 2019
Posts: 26
Location: India
CAT Tests
Re: A boat takes a total of 6 hours to row 8 kms downstream and to return  [#permalink]

Show Tags

New post 06 Jan 2020, 06:53
1
Time = Distance/Rate

Rate = 3+R (Downstream) and 3 - R (Upstream)

6 = 8/(3+R) + 8/(3-R)
6 = {8(3-R) + 8(3+R)}/(9-R^2)

Solving this, we get -
54 - 6R^2 = 48
6R^2 = 6
R = 1

Therefore, time spent going downstream = 8/(3+1) = 2

As an additional check, downstream time + upstream time = 6 hrs.
Downstream = 2, Upstream = 8/(3-1) = 4. Total = 6 hrs.

Option B.

Please Kudos :)
GMAT Club Bot
Re: A boat takes a total of 6 hours to row 8 kms downstream and to return   [#permalink] 06 Jan 2020, 06:53
Display posts from previous: Sort by

A boat takes a total of 6 hours to row 8 kms downstream and to return

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne