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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: 56300
Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3  [#permalink]

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13 Mar 2017, 08:16
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97% (00:56) correct 3% (01:10) wrong based on 60 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 and Tommy the same time to each mow the lawn individually.
(2) Teddy mows faster than both Mike and Tommy.

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Director
Joined: 05 Mar 2015
Posts: 995
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3  [#permalink]

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13 Mar 2017, 12:13
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) It would take Mike and Tommy the same time to each mow the lawn individually.
(2) Teddy mows faster than both Mike and Tommy.

No info on particular hours taken by Mike, Tommy and/or Teddy
thus time taken by all five could be anything
Combining ..insuff

Ans E
Manager
Joined: 06 Dec 2016
Posts: 243
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3  [#permalink]

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13 Mar 2017, 12:24
I think the answer is E
because you do not have any information Mike, Tommy and Teddy hours.
Intern
Joined: 21 Nov 2015
Posts: 16
Concentration: Finance, Economics
Schools: Erasmus '20
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3  [#permalink]

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27 Aug 2018, 08:47
You need to know a time for Joe +Seth+Mike+Tommy+Teddy.
WE know that Joe+Seth =2,5h
We need to find out time for Mike+Tommy+Teddy
1. Mike=Tommy –but we do not know the time and nothing about TEDDY – no
2. Just said that Tedddy is faster than Make+Tommy, but we do not know how much

1-2 no info about time hence why is E
Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3   [#permalink] 27 Aug 2018, 08:47
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