a can do a job in 15 days ,and b in 10 days . how many will they take to finish the job if they work together ?
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Work done by A =1/15
Work done by B=1/10
Work done by both A+B=1/15+1/10
=(2+3)/30
=5/30
=1/6
Therefore time taken by them to work together
=6 days
Work done by B=1/10
Work done by both A+B=1/15+1/10
=(2+3)/30
=5/30
=1/6
Therefore time taken by them to work together
=6 days
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