1.

'A' can complete a piece of work in 5 days and ' B ' can complete the same piece of work in 10 days. In how many days can 'A' and ' B ' together complete the same work ?

Answer»

31 days



A can do 1/5 work per day.
B can do 1/10 work per day.
Therefore, (A + B) can do 1/5 + 1/10 = 3/10 per day
Therefore, Total NUMBER of days to COMPLETE work = 1/3/10 = 10/3 days



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