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'A' can do the job in 20 days. He does (1/20th) of the job in 1 day. After 4 days, he finished

(4/20ths) of the job, and there were (16/20ths) remaining. That's when 'B' came along.

'B' finished the (16/20ths) of the job in 16 days, so 'B' also does (1/20th) of the job each day.

If they work together from the beginning of a new job, they do (1/20 + 1/20) = 2/20 = 1/10th

of the job each day, and it takes them 10 days to do the whole thing together.

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15y ago

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