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05 Jul 2018, 01:43
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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93% (01:04) correct
7%
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wrong
based on 449
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Machine A, working alone at its constant rate, manufactures 280 bolts per hour, and machine B, working alone at its constant rate, manufactures 220 bolts per hour. How many hours will it take for machines A and B, working together at their respective constant rates,to manufacture 1,000 bolts?
A. 1
B. 1.3
C. 1.5
D. 1.8
E. 2
A. 1
B. 1.3
C. 1.5
D. 1.8
E. 2
gmatexam439
GMAT 1: 730 Q49 V41
Posts: 1,070
05 Jul 2018, 01:51
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Bunuel
Machine A, working alone at its constant rate, manufactures 280 bolts per hour, and machine B, working alone at its constant rate, manufactures 220 bolts per hour. How many hours will it take for machines A and B, working together at their respective constant rates,to manufacture 1,000 bolts?
A. 1
B. 1.3
C. 1.5
D. 1.8
E. 2
A. 1
B. 1.3
C. 1.5
D. 1.8
E. 2
In 1 hour A and B will make 220+280 bolts. Thus, in one hour total of 500 bolts are produced.
For 1000 bolts, 2 hours would be required.
Answer: E
Posted from my mobile device
05 Jul 2018, 06:17
Kudos
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Bunuel
Machine A, working alone at its constant rate, manufactures 280 bolts per hour, and machine B, working alone at its constant rate, manufactures 220 bolts per hour. How many hours will it take for machines A and B, working together at their respective constant rates,to manufacture 1,000 bolts?
A. 1
B. 1.3
C. 1.5
D. 1.8
E. 2
A. 1
B. 1.3
C. 1.5
D. 1.8
E. 2
Rate of manufacturing of machine A=280 bolts per hour
Rate of manufacturing of machine B=220 bolts per hour
Combined rate*time=Work done
or, (280+220)bolt/hour*time=1000 bolts
Or, Time=\(\frac{1000}{500}\)=2 hours
Ans. E
