GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 15 Oct 2019, 22:42 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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  At time t measured in minutes after the beginning of the timed period,

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

Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 58347
At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags 00:00

Difficulty:   5% (low)

Question Stats: 84% (01:29) correct 16% (01:55) wrong based on 154 sessions

HideShow timer Statistics At time t measured in minutes after the beginning of the timed period, which of the following gives the speed of the train in accordance with the table?

(A) t/6
(B) 10t
(C) 40 + t
(D) 40 + t/6
(E) 40 + 10t

_________________
Intern  B
Joined: 17 Nov 2016
Posts: 12
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

1
IMO D.

I plugged in values for ‘t’ as 30 and as per graph speed is 45 for 30 mins.

D satisfies the condition

Posted from my mobile device
Manager  G
Joined: 08 Apr 2017
Posts: 76
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

When using t = 0, A and B gives the speed as 0 but per table it's 40.
How to make it easy to choose, at speed t = 45, speed is a decimal and only option D would get you a decimal

Sent from my iPhone using GMAT Club Forum
Manager  S
Joined: 30 Nov 2016
Posts: 103
Location: India
Concentration: Finance, Strategy
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

For a difference of 30 mins the corresponding change in speed is 5, next we find that the change is proportional throughout ie t/6. so the speed of the train after time t is 40+ t/6 (D).
Intern  B
Joined: 11 Dec 2016
Posts: 4
Location: India
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

animesh mohanty wrote:
For a difference of 30 mins the corresponding change in speed is 5, next we find that the change is proportional throughout ie t/6. so the speed of the train after time t is 40+ t/6 (D).

Pls. Note the time is in minutes not hours.
Manager  S
Joined: 30 Nov 2016
Posts: 103
Location: India
Concentration: Finance, Strategy
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

HG90 wrote:
animesh mohanty wrote:
For a difference of 30 mins the corresponding change in speed is 5, next we find that the change is proportional throughout ie t/6. so the speed of the train after time t is 40+ t/6 (D).

Pls. Note the time is in minutes not hours.

change of 5 mph =0.083 miles per min which is achieved in 30 mins. This is the same as change of 0.041 miles per min that is achived in 15 mins. so the logic is correct.
P.S. i didn't mark the difference initially. Thank!
Intern  B
Joined: 25 Apr 2017
Posts: 3
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

calculate the speed by substituting time at t= 30 minutes.
t= 30 minutes = 1/2 hrs
E- 40+10t = 40+10*1/2 = 40+5 = 45 mph

hence E is the answer.
Senior SC Moderator V
Joined: 22 May 2016
Posts: 3545
At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

Bunuel wrote: At time t measured in minutes after the beginning of the timed period, which of the following gives the speed of the train in accordance with the table?

(A) t/6
(B) 10t
(C) 40 + t
(D) 40 + t/6
(E) 40 + 10t

I think elimination might be quicker. Find one pair of correlated numbers (time, speed), to disprove each answer. I varied it just to be careful.

(A) t/6? S = 45, t = 30
45$$\neq$$(30/6) = 5: NO

(B) 10t? S = 50, t = 60
50 $$\neq$$(10 * 60) = 600: NO

(C) 40 + t? S = 55,t = 90
55 $$\neq$$ (40 + 90) = 130: NO

(D) 40 + t/6? S = 60, t = 120
60 = (40 + 120/6) = (40 + 20) = 60
First test works. Come back

(E) 40 + 10t? S = 70, t = 180
70 $$\neq$$(40 + 180) = 220: NO

By POE, D is the answer. Test it:
50 S, 60t: (40 + 60/6) = (40 + 10) = 50
45 S, 30t: (40 + 30/6) = (40 + 5) = 45

That's enough.

_________________
SC Butler has resumed! Get two SC questions to practice, whose links you can find by date, here.

Choose life.
Intern  Joined: 21 May 2016
Posts: 1
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

time is given in minutes and speed in m.p.h
60 min = 1 hr
in the table 60 min gives speed as 55
Answer E satisfies the condition
40 + 10(1) = 50

validation: for 90 min: t = 3/2
40 + 10(3/2)= 55
Target Test Prep Representative G
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2817
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

Bunuel wrote: At time t measured in minutes after the beginning of the timed period, which of the following gives the speed of the train in accordance with the table?

(A) t/6
(B) 10t
(C) 40 + t
(D) 40 + t/6
(E) 40 + 10t

Let’s plug in values from the table. In the first column, we have t = 0 for time and speed = 40.

We see that C, D, and E yield a speed of 40 when using 0 for t.

Testing the second column, we have t = 30 and speed = 45. Thus, we see that answers C and E do not yield 45 when t = 30. Answer choice D yields 40 + 30/6 = 45.

_________________

Jeffrey Miller

Head of GMAT Instruction

Jeff@TargetTestPrep.com

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Non-Human User Joined: 09 Sep 2013
Posts: 13161
Re: At time t measured in minutes after the beginning of the timed period,  [#permalink]

Show Tags

Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________ Re: At time t measured in minutes after the beginning of the timed period,   [#permalink] 01 Nov 2018, 03:17
Display posts from previous: Sort by

At time t measured in minutes after the beginning of the timed period,

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

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