Question

A can do a piece of work in 15 days, B can do a same work in 12 days. How long will it take if they work together ​

Answer 1

Answer:

days taken to A to complete = 15 days

1 work = 15 days

1 days = 1/15

days taken to B to complete = 12 days

1 work = 12 days

1 days = 1/12

days taken to complete together if they work = 1/x

= 1 /12 + 1/15 = 5 + 4 /60 = 9/60 = 3/20

3 /20 = 1/x

20/3 = x /1

both together complete this work in 20 /3 days

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