Last visit was: 26 Dec 2024, 11:54 It is currently 26 Dec 2024, 11:54
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

Close

GRE Prep 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 GRE 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
PREVIOUS TOPIC
NEXT TOPIC

A boat traveled upstream 90 miles at an average speed of (v-3) miles

Tags :
Find Similar Topics  About  Add a Tag

Show Tags
Hide Tags

User avatar
D
GeminiHeat
GRE Prep Club Team Member
Joined: 20 Feb 2017
Posts: 2506
Own Kudos [?]: 3679 [0]
Given Kudos: 1053
GPA: 3.39
Send PM
A boat traveled upstream 90 miles at an average speed of (v-3) miles [#permalink] New post   22 Nov 2021, 06:47
Expert Reply
00:00

Question Stats:

100% (04:13) correct 0% (00:00) wrong based on 4 sessions

Hide Show timer Statistics

A boat traveled upstream 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour. If the trip upstream took a half hour longer than the trip downstream, then how many hours did it take the boat to travel downstream?

A. 2.5

B. 2.4

C. 2.3

D. 2.2

E. 2.1
ShowHide Answer
Official Answer
A
User avatar
P
GreenlightTestPrep
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Own Kudos [?]: 12238 [1]
Given Kudos: 136
Send PM

Top Member of the Month
Re: A boat traveled upstream 90 miles at an average speed of (v-3) miles [#permalink] New post   22 Nov 2021, 07:24
1
GeminiHeat wrote:
A boat traveled upstream 90 miles at an average speed of (v-3) miles per hour and then traveled the same distance downstream at an average speed of (v+3) miles per hour. If the trip upstream took a half hour longer than the trip downstream, then how many hours did it take the boat to travel downstream?

A. 2.5

B. 2.4

C. 2.3

D. 2.2

E. 2.1

I like to begin with a "word equation."
We can write:
travel time upstream = travel time downstream + 1/2

Time = distance/rate
So, we can replace elements in our word equation to get:
90/(v-3) = 90/(v+3) + 1/2

Now solve for v (lots of work here)
.
.
.
v = 33

So, travel time downstream = 90/(v+3)
= 90/(33+3)
= 90/36
= 5/2
= 2 1/2 hours
Answer: A

Cheers,
Brent
Prep Club for GRE Bot
gmatclubot
Re: A boat traveled upstream 90 miles at an average speed of (v-3) miles [#permalink]
22 Nov 2021, 07:24
Moderators:
adewale223
GRE Instructor
88 posts
bronaugust
GRE Forum Moderator
37 posts
BrushMyQuant
Moderator
1115 posts
VibhuAnurag
GRE Instructor
234 posts

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

Main navigation

Partners

GRE Resources

www.ets.org/gre | About | Terms and Conditions and Privacy Policy | Prep Club for GRE Rules | Contact