CAT 2018 Question Paper - Slot 1 Solutions | Work and Time

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#CAT2018 Question:

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. 40
B. 32
C. 36
D. 45

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Best wishes for CAT preparation.
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All work time questions can be solved without fractions. This just complicates calculations.

josephsebastian