NEW HERE? LEARN MORE
closeclose
Last visit was: 25 Apr 2024, 04:30 It is currently 25 Apr 2024, 04:30
Decision Tracker
My Rewards
New posts
New comers' posts

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

Last year Harold's average time to finish the qualifying event was

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92912
Own Kudos [?]: 618917 [7]
Given Kudos: 81595
Send PM
CAT Tests Forum Quiz Mode
Last year Harold's average time to finish the qualifying event was [#permalink] New post   16 Jan 2017, 09:30
7
Bookmarks
Expert Reply
00:00
A
B
C
D
E

Difficulty:

45% (medium)

Question Stats:

63% (01:37) correct 37% (01:35) wrong based on 164 sessions
Hide Show timer Statistics
Last year Harold's average time to finish the qualifying event was three hours. If he knows that he can increase his speed this year by 20%, how many minutes should it take him to complete the event?

A. 150
B. 144
C. 120
D. 90
E. 36
ShowHide Answer
Official Answer
A
User avatar
L
GMATinsight
GMAT Club Legend
GMAT Club Legend
Joined: 08 Jul 2010
Status:GMAT/GRE Tutor l Admission Consultant l On-Demand Course creator
Posts: 5958
Own Kudos [?]: 13387 [1]
Given Kudos: 124
Location: India
GMAT: QUANT+DI EXPERT
Schools: IIM (A) ISB '24
GMAT 1: 750 Q51 V41
WE:Education (Education)
Send PM
Reviews Badge
Re: Last year Harold's average time to finish the qualifying event was [#permalink] New post   17 Jan 2017, 01:33
1
Kudos
Expert Reply
Bunuel wrote:
Last year Harold's average time to finish the qualifying event was three hours. If he knows that he can increase his speed this year by 20%, how many minutes should it take him to complete the event?

A. 150
B. 144
C. 120
D. 90
E. 36


Let the Work of Qualifying event = 60 units
Time taken to finish the work = 3 hours
i.e. Speed per hour = 60/3 = 20 units of work per hour

New speed = 20% more than previous speed = 1.2*20 = 24 units per hour

Time to finish the even at new speed = 60/24 = 2.5 hours = 150 minutes

Answer: OPtion A
User avatar
P
JeffTargetTestPrep
Target Test Prep Representative
Joined: 04 Mar 2011
Status:Head GMAT Instructor
Affiliations: Target Test Prep
Posts: 3043
Own Kudos [?]: 6272 [1]
Given Kudos: 1646
Send PM
Re: Last year Harold's average time to finish the qualifying event was [#permalink] New post   18 Jan 2017, 11:08
1
Kudos
Expert Reply
Bunuel wrote:
Last year Harold's average time to finish the qualifying event was three hours. If he knows that he can increase his speed this year by 20%, how many minutes should it take him to complete the event?

A. 150
B. 144
C. 120
D. 90
E. 36


Recall that rate x time = job (or rate = job/time, or time = job/rate). Since Harold’s time to complete the event was 3 hours, we can say that his rate was 1 job per 3 hours; i.e., his rate is 1/3. Since he’s increasing his speed by 20%, his new rate is:

(1/3) x 1.2

(1/3) x 12/10 = 4/10 = 2/5

Since his new rate is ⅖, his new time is 1/(2/5) = 5/2 = 2.5 hours. Thus he can complete the event in 2.5 x 60 = 150 minutes.

Answer: A
User avatar
D
Kurtosis
Current Student
Joined: 13 Apr 2015
Posts: 1436
Own Kudos [?]: 4546 [0]
Given Kudos: 1228
Location: India
Send PM
GMAT ToolKit User Reviews Badge
Re: Last year Harold's average time to finish the qualifying event was [#permalink] New post   16 Jan 2017, 23:10
Let the speed of last year be = x; Current year speed = 1.2x
Let time taken this year be = t

Since the distance traveled is the same; 3*x = 1.2*x*t --> t = 3/1.2 = 2.5 hours = 150 mins.

Answer: A
User avatar
B
SI777
Manager
Manager
Joined: 29 Feb 2016
Posts: 96
Own Kudos [?]: 45 [0]
Given Kudos: 237
Location: India
Schools: Kelley '21 (A$) Tepper '21 (D) Kenan-Flagler '21 (WL) McDonough '21 (A$) Olin '21 (A$) Jones '21 (WL)
GMAT 1: 700 Q49 V35
GPA: 3
Send PM
GMAT ToolKit User
Re: Last year Harold's average time to finish the qualifying event was [#permalink] New post   16 Jan 2017, 23:59
Bunuel wrote:
Last year Harold's average time to finish the qualifying event was three hours. If he knows that he can increase his speed this year by 20%, how many minutes should it take him to complete the event?

A. 150
B. 144
C. 120
D. 90
E. 36



Speed = distance / time

Initially S1=D/T1 -- > T1 = 3 hours --> s1 = D/3

This year S2 = D/T2 -- > S2 = 1.2 S1 (20% increase)

Equate --> 3*s1 = 1.2 * s1 * T2 --> T2 = 3/1.2 * 60 = 150 mins
User avatar
L
Abhishek009
Board of Directors
Joined: 11 Jun 2011
Status:QA & VA Forum Moderator
Posts: 6072
Own Kudos [?]: 4689 [0]
Given Kudos: 463
Location: India
GPA: 3.5
WE:Business Development (Commercial Banking)
Send PM
GMAT ToolKit User
Re: Last year Harold's average time to finish the qualifying event was [#permalink] New post   17 Jan 2017, 09:26
Bunuel wrote:
Last year Harold's average time to finish the qualifying event was three hours. If he knows that he can increase his speed this year by 20%, how many minutes should it take him to complete the event?

A. 150
B. 144
C. 120
D. 90
E. 36


Let speed be 20 units/hr
Time taken is 3
Total distance covered is 60 units

Now, speed Increases to 24 units/hr
Distance is 60 units
So, Time taken is 60/24*60 = 150 minutes...

Hence, correct answer will be (A) 150
User avatar
B
abhi4212
Intern
Intern
Joined: 19 Jun 2016
Posts: 22
Own Kudos [?]: 26 [0]
Given Kudos: 20
Location: India
GMAT 1: 590 Q45 V25
WE:Engineering (Manufacturing)
Send PM
Re: Last year Harold's average time to finish the qualifying event was [#permalink] New post   17 Jan 2017, 10:28
Bunuel wrote:
Last year Harold's average time to finish the qualifying event was three hours. If he knows that he can increase his speed this year by 20%, how many minutes should it take him to complete the event?

A. 150
B. 144
C. 120
D. 90
E. 36



Let the distance be "X"

Initial speed S=X/3*60=X/180;

After increase S1=(X/180) + 0.2 (X/180);
S1= 1.2X/180

1.2X/180= X/T
T=150 min.
User avatar
L
Mo2men
RSM Erasmus Moderator
Joined: 26 Mar 2013
Posts: 2461
Own Kudos [?]: 1360 [0]
Given Kudos: 641
Concentration: Operations, Strategy
Schools: Erasmus (II)
Send PM
Reviews Badge
Last year Harold's average time to finish the qualifying event was [#permalink] New post   17 Jan 2017, 16:10
Last year time = 3 * 60 = 180 min.

Let the distance = 180 meter...............speed =d/t =180/180= 1 m/min

This year speed =1.2 * 1= 1.2 m/min

time required this year = 180/1.2 = 1800/ 12 = 18 * 100/12= 150 min

Answer: A
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 32667
Own Kudos [?]: 821 [0]
Given Kudos: 0
Send PM
Re: Last year Harold's average time to finish the qualifying event was [#permalink] New post   12 Oct 2020, 11:30
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.
GMAT Club Bot
gmatclubot
Re: Last year Harold's average time to finish the qualifying event was [#permalink]
12 Oct 2020, 11:30
Moderators:
Bunuel
Math Expert
92912 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3137 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions