7. ‘A’ can complete a job in 60 days. ‘B’ can complete the same job in 15 days then find the number of days to complete the job if they work together ?
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Answer:-
job done by A in 1 day is 1/60
job done by B in 1 day is 1/15
job done together by A and B in 1 day = 1/12
no. of days to complete the job = 1 ÷ 1/12 = 1 × 12 = 12
Hence, the required answer is 12 days.
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