A can complete a certain work in 36 days, and B can complete the same work in P days. Find the time taken by them to complete the whole work while working together, where P is the missing term in the given series.
30, 42, 56, (?), 90, 110,132.
1
16 days
2
4 days
3
12 days
4
24 days
5
8 days