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15 May 2018, 02:45
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D
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% (01:23) correct
13%
(01:35)
wrong
based on 128
sessions
History
Date
Time
Result
Not Attempted Yet
A certain machine drills 30 holes in 8 minutes. At that constant rate, how many holes will 4 such machines drill in \(1\frac{1}{3}\) hours?
(A) 300
(B) 900
(C) 960
(D) 1,200
(E) 2,560
(A) 300
(B) 900
(C) 960
(D) 1,200
(E) 2,560
Updated on: 16 May 2018, 10:56
Originally posted by houston1980 on 15 May 2018, 02:50.
Last edited by houston1980 on 16 May 2018, 10:56, edited 1 time in total.
Last edited by houston1980 on 16 May 2018, 10:56, edited 1 time in total.
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1 machine drills 30 holes in 8 minutes
1 machine drills 300 holes in 80 minutes. 80 minutes = \(1\frac{1}{3}\) hours
4 machines drill 300*4 = 1200 holes in 80 minutes
Hence option D = 1200 is the answer.
1 machine drills 300 holes in 80 minutes. 80 minutes = \(1\frac{1}{3}\) hours
4 machines drill 300*4 = 1200 holes in 80 minutes
Hence option D = 1200 is the answer.
15 May 2018, 02:57
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Rate of one machine is \(\frac{(30 holes)}{(8 mins)}\)
therefore, Rate of 4 machines is \(\frac{4 * (30 holes)}{(8 min)}\)
= \(\frac{15 holes}{min}\)
therefore total number of holes in \(\frac{4}{3} *60 mins\)
= \(15 * 80\)
= 1200
Answer is D
therefore, Rate of 4 machines is \(\frac{4 * (30 holes)}{(8 min)}\)
= \(\frac{15 holes}{min}\)
therefore total number of holes in \(\frac{4}{3} *60 mins\)
= \(15 * 80\)
= 1200
Answer is D
