Last visit was: 23 Jul 2024, 23:22 It is currently 23 Jul 2024, 23:22
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
SORT BY:
Date
Math Expert
Joined: 02 Sep 2009
Posts: 94589
Own Kudos [?]: 643424 [0]
Given Kudos: 86728
Send PM
Director
Director
Joined: 06 Dec 2021
Posts: 520
Own Kudos [?]: 547 [0]
Given Kudos: 737
Location: India
Concentration: Technology, International Business
GPA: 4
WE:Human Resources (Telecommunications)
Send PM
Manager
Manager
Joined: 11 Aug 2021
Posts: 62
Own Kudos [?]: 14 [0]
Given Kudos: 11
Location: India
Concentration: General Management, Strategy
Schools: Goizueta '25
GMAT 1: 600 Q47 V27
Send PM
Intern
Intern
Joined: 19 Mar 2022
Posts: 20
Own Kudos [?]: 15 [1]
Given Kudos: 58
Send PM
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If [#permalink]
Bunuel wrote:
Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3 other boys, Mike, Tommy and Teddy, helped, how long would it take to mow the same lawn with all of them starting at the same time?

(1) Tommy and Teddy each individually work at a rate that is twice Mike's rate.
(2) Mike would take 7 hours to mow the entire yard alone.


pratiksha1998 wrote:
How do we know the individual rates of Joe and Seth? Since we do not know that how can we find the rate of all working together?

we don't need to know the individual rates we can assume that both are one entity act as one. so now we have only 3 entity with the help of option(as (1) gives combined information of rates.

My thought process in solving this question.

there are 2 person another 3 join and we need to find time when all work together.

1- gives rate of another 2 person but what about 3rd person if the rate of 3rd person changes then time changes also. so INSUFFICIENT
2- gives rate of only 3rd person so same as 1. so INSUFFICIENT

now lets combine

now we have everyone's rate (assuming joe and Seth as one and tommy and teddy as one) and they do the same work so we can find accumulate time.
hence option C correct answer.
GMAT Club Bot
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If [#permalink]
Moderator:
Math Expert
94589 posts