alleryA tailor stitches a batch in 20 days, her partner in 30 days. Together they finish in
A25 days
B12 days
C10 days
D15 days
Answer & Solution
Correct answer: B. 12 days
Their combined rate is 1/20 + 1/30 = 5/60 = 1/12 per day, giving 12 days.
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