Question

if a work
can be completed by A in 30 days and B in
60 days, then the number of days taken
by them to finish the work,
working
together is​

Answer 1

Answer:    12 days.

Step-by-step explanation-

A takes 30 days to complete - 1 work

so A takes 1 day to complete - 1/30th of the work

B takes 20 days to complete - 1 work

so B takes 1 day to complete 1/20th of the work

So A and B together do in 1 day - 1/30+ 1/20= 5/60th of the work

if 5/60th of the work is done in - 1 day

Then 1 work is done in - 1/ 5/60 days= 60/5 days=12 days.

So A+B does the work in 12 days.

Answer 2

Answer:

30+60

=90/2

=45 is the answer