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If it takes Patrick 4 hours to paint a room, how long did it take Patr

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If it takes Patrick 4 hours to paint a room, how long did it take Patr  [#permalink]

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New post 16 Jan 2017, 09:36
2
1
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

89% (00:39) correct 11% (00:33) wrong based on 90 sessions

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Re: If it takes Patrick 4 hours to paint a room, how long did it take Patr  [#permalink]

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New post 16 Jan 2017, 10:12
1
1
Answer is A

The productivity of Patrick is 1/4 of the room per hour

(A) If Roger paint it twice as long to paint then I will we need 8 hours => His productivity is 1/8

Together the productivity is 1/4 + 1/8 = 3/8

Therefore, it will take 3/8 * X(number of hours) = 1 => X = 8/3 = 2 hours and 40 minutes to complete

(B) Give no informations on Roger and we already know that he takes 4 hours.
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Re: If it takes Patrick 4 hours to paint a room, how long did it take Patr  [#permalink]

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New post 16 Jan 2017, 12:25
Statement 1- sufficient
Statement - we know nothing about Roger ..Nd this re establishes the data given in the question that Patrick takes 4hr
So A

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Re: If it takes Patrick 4 hours to paint a room, how long did it take Patr  [#permalink]

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New post 17 Jan 2017, 15:48
1
If it takes Patrick 4 hours to paint a room, how long did it take Patrick and Roger working together?

(1) It takes Roger twice as long to paint the same room.

Patrick takes 4 hrs and Roger takes 8 hrs. Total= 4 * 8/ (4+8) =32/12=8/3 hrs

Sufficient

(2) Patrick painted the room from 10 a.m. to 2 p.m.[/quote]

Same info in the prompt that Patrick takes 4 hrs. No new info

Insufficient

Answer: A
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Re: If it takes Patrick 4 hours to paint a room, how long did it take Patr  [#permalink]

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New post 17 Oct 2018, 09:26
Hello from the GMAT Club BumpBot!

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Re: If it takes Patrick 4 hours to paint a room, how long did it take Patr   [#permalink] 17 Oct 2018, 09:26
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