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# Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3

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Math Expert
Joined: 02 Sep 2009
Posts: 50058
Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3  [#permalink]

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11 Apr 2017, 01:07
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Difficulty:

5% (low)

Question Stats:

95% (00:54) correct 5% (00:24) wrong based on 53 sessions

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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) It would take Mike, Tommy and Teddy 1 hour and forty minutes to mow the entire lawn.
(2) It would take each boy 5 hours to mow the law alone.

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Intern
Joined: 12 Dec 2010
Posts: 40
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3  [#permalink]

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12 Apr 2017, 00:20
IMHO D,

Statement 1
The combined rate of the Mike Tommy and teddy is 1/one hour 40 mins or 1/ 100 mins which when added with the combined rate of Joe and Smith 1/(2:30) or 1/150 mins gives the combined rate as 1/100 + 1/150 which is 1/60(mins) or 1 hour. SUFFICIENT

Statement 2:

Each boy takes 5 hours individually and together 5 boys can do in an hour. SUFFICENT

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Manager
Joined: 10 Apr 2015
Posts: 189
GPA: 3.31
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3  [#permalink]

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12 Apr 2017, 09:29
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) It would take Mike, Tommy and Teddy 1 hour and forty minutes to mow the entire lawn.
Suff.
(2) It would take each boy 5 hours to mow the law alone.
suff.

AnsD
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Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3 &nbs [#permalink] 12 Apr 2017, 09:29
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