railway RPF SI Mock Test Series 2024 Quantitative Aptitude Time and Work Work Efficiency

Radha who is half as efficient as Kirti, will take 30 days to complete a task if she works alone. If Radha and Kirti work together, how long will they take to complete the task?

1
20 days
2
10 days
3
12 days
4
15 days
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