Manu working alone on a job takes 12 days more than what he would have taken if

Manu working alone on a job takes 12 days more than what he would have taken if Bhanu had worked along with him while Bhanu working alone on the same job takes 27 days more than what he would have taken if Manu had worked along with him. Find the time that both of them working together would take to do the job.

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