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

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

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New post 16 Jan 2017, 09:35
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A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

91% (00:57) correct 9% (01:11) wrong based on 89 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) Joe mows faster than Seth.
(2) Mike, Tommy, and Teddy would finish the same lawn in 1 hour 45 minutes.

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

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New post 16 Jan 2017, 09:45
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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) Joe mows faster than Seth.
(2) Mike, Tommy, and Teddy would finish the same lawn in 1 hour 45 minutes.


We know the work rate of J+S.
For combined rate of all 5, we need rate of rest of 3 people combined which is stated in B.

To determine the rate:
We can consider J and S to be single person taking 2 hours rate = 1/2
Similarly we can consider other 3 as a single person taking 1.75 7/4 hours rate = 4/7

Time together - 1/2 + 4/7 = 15/14 hours

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

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New post 15 Aug 2019, 02:05
Bunuel help me out on this one please
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Re: Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3   [#permalink] 15 Aug 2019, 02:05
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Two boys, Joe and Seth, can mow a lawn in 2 hours thirty minutes. If 3

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