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# If 7 workers can assemble a car in 8 hours, how long would it take 12

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Math Expert
Joined: 02 Sep 2009
Posts: 58311
If 7 workers can assemble a car in 8 hours, how long would it take 12  [#permalink]

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10 Apr 2019, 00:10
00:00

Difficulty:

15% (low)

Question Stats:

84% (01:33) correct 16% (01:34) wrong based on 45 sessions

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If 7 workers can assemble a car in 8 hours, how long would it take 12 workers to assemble the same car?

(A) 3hrs
(B) 3 1/2 hrs
(C) 4 2/3 hrs
(D) 5hrs
(E) 6 1/3 hrs

Source: Nova GMAT
Difficulty Level: 550

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Re: If 7 workers can assemble a car in 8 hours, how long would it take 12  [#permalink]

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10 Apr 2019, 01:07

7*8=56 (R*T=W)
12*X=56
X=4.6
c?
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Joined: 31 Oct 2013
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Concentration: Accounting, Finance
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Re: If 7 workers can assemble a car in 8 hours, how long would it take 12  [#permalink]

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10 Apr 2019, 01:36
1
Bunuel wrote:
If 7 workers can assemble a car in 8 hours, how long would it take 12 workers to assemble the same car?

(A) 3hrs
(B) 3 1/2 hrs
(C) 4 2/3 hrs
(D) 5hrs
(E) 6 1/3 hrs

7 workers need 8 hours

1 worker needs 7*8 hrs = 56 hrs.

12 workers needs = 56/12 = 14/3 = 4 2/3 hrs.

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Re: If 7 workers can assemble a car in 8 hours, how long would it take 12  [#permalink]

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10 Apr 2019, 02:26
Bunuel wrote:
If 7 workers can assemble a car in 8 hours, how long would it take 12 workers to assemble the same car?

(A) 3hrs
(B) 3 1/2 hrs
(C) 4 2/3 hrs
(D) 5hrs
(E) 6 1/3 hrs

time taken by 1 worker = 56 hrs to build a car
so for 12 workers time taken ; 56/12; 4.66 hrs
IMO C
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Re: If 7 workers can assemble a car in 8 hours, how long would it take 12   [#permalink] 10 Apr 2019, 02:26
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