Day 2 problem of my Math mini-contest 😎

Math mini-contest problem for Day 2 😎

A developer (dev) can make a Hive dapp alone in 30 days. Another dev can make the same alone in 36 days. If both work together, how long will it take the two to finish making the dapp assuming all other variables equal?
H2
H3
H4
3 columns
2 columns
1 column
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