Prabhas is twice as good a workman as Rana and finishes a piece of work in 3 hours. In how many hours they together could finish that piece of work?
A) 3 hrs
B) 3.5 hrs
C) 2.5 hrs
D) 2 hrs
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they can finish it in 2 hours because Prabhas is twice as good as Ravana
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Answer:
2 hours
Step-by-step explanation:
Ratio of times taken by Prabhas and Rana = 1 : 2.
Prabhas finishes work in 3 hours; therefore Rana takes 6 hours to complete.
Prabhas's 1 hour work = 1/3
Rana's 1 hour work = 1/6
Prabhas and Rrana 1 hour work = 1/3+1/6=1/2
Therefore the whole work can be done in 2 hours by both working together.
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