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A and B separately can build a wall in 1...

A and B separately can build a wall in 12 days and 16 days, respectively. If they work alternatively, starting with A, in how many days will the wall be built?
A और B अलग-अलग क्रमशः 12 दिनों और 16 दिनों में एक दीवार का निर्माण कर सकते हैं। यदि वे एक दिन छोड़कर कार्य करते हैं, तो A से शुरू करके, कितने दिनों में दीवार बनाई जाएगी?

A

`7 2/3` days

B

`12 2/3` days

C

`13 2/3` days

D

`6 3/4` days

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