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10 Jul 2019, 01:05
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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)!
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Question Stats:
67% (02:25) correct
33%
(02:27)
wrong
based on 3
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Not Attempted Yet
Official CAT 2018 Questions; Section: QA
Humans and robots can both perform a job but at different efficiencies. Fifteen humans and five robots working together take thirty days to finish the job, whereas five humans and fifteen robots working together take sixty days to finish it. How many days will fifteen humans working together (without any robot) take to finish it?
A) 45
B) 36
C) 40
D) 32
Humans and robots can both perform a job but at different efficiencies. Fifteen humans and five robots working together take thirty days to finish the job, whereas five humans and fifteen robots working together take sixty days to finish it. How many days will fifteen humans working together (without any robot) take to finish it?
A) 45
B) 36
C) 40
D) 32
11 Jul 2019, 20:05
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Narenn
Hello Sir, You cannot (legally) post official CAT questions on any forums or anywhere. Just FYI
Solution : Simply by writing 2 equations
15h+5r=1/30 and 5h+15r=1/60
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