alleryएक दर्जी कपड़ों के एक बैच को 20 दिनों में सिलती है और उसकी साथी 30 दिनों में सिलती है। दोनों मिलकर इसे कितने दिनों में पूरा करेंगी?
A25 दिन
B12 दिन
C10 दिन
D15 दिन
Answer & Solution
Correct answer: B. 12 दिन
उनकी संयुक्त दर प्रतिदिन 1/20 + 1/30 = 5/60 = 1/12 भाग है, अतः 12 दिन लगेंगे।
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