Question

a alone can do a piece of work in 10 days and B alone can do it 15 days in how many days will A and B together

Answer 1

I think the answer is 6 days .

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Answer 2

A takes 10 days & B takes 15 days. So, let the total work be LCM(10,15) = 30 Units

A -> 10 days = 3 Units/dayB -> 15 days = 2 Units/day

A + B = 5 Units/day

Thus, TOTAL TIME = 30units/5units = 6 days