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24 Nov 2015, 10:49
Kudos
Bookmarks
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
87% (01:12) correct
13%
(01:30)
wrong
based on 601
sessions
History
Date
Time
Result
Not Attempted Yet
If it would take one machine 10 minutes to fill a large production order and another machine 12 minutes to fill the same order, how many minutes would it take both machines working together, at their respective rates, to fill the order?
A. 4 1/60
B. 5
C. 5 5/11
D. 5 1/2
E. 11
PS21161
A. 4 1/60
B. 5
C. 5 5/11
D. 5 1/2
E. 11
PS21161
Icecream87
Joined: 23 Sep 2015
Last visit: 02 Aug 2018
Posts: 332
Given Kudos: 72
Location: France
Schools: Insead Sept '17 (M$)
GMAT 1: 690 Q47 V38
GMAT 2: 700 Q48 V38
WE:Real Estate (Mutual Funds and Brokerage)
Products:
24 Nov 2015, 11:16
Kudos
Bookmarks
Bunuel
C
the total rate : 1/10 + 1/12 = 11/60
Work/Rate = 1*60/11 or 5 5/11
24 Nov 2015, 11:26
Kudos
Bookmarks
Bunuel
Let the total production order be of 60 units
\(1^{st}\) machine can fill the production order at 6 units per minute
\(2^{nd}\) machine can fill the production order at 5 units per minute
So, \(1^{st}\) and \(2^{nd}\) machine working togather can fill the production order at 11 units per minute
The total production order is of 60 units so the time taken to complete the order is - \(\frac{60}{5}\) = \(5 \frac{5}{11}\) minutes
Hence answer is (C) , \(5 \frac{5}{11}\) minutes
