allerySita does a job in 30 days. Sita and Tara together do it in 20 days. Tara alone needs
A40 days
B45 days
C50 days
D60 days
Answer & Solution
Correct answer: D. 60 days
Tara's rate is 1/20 - 1/30 = 1/60, so she needs 60 days.
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