Question

A worker takes 3 hours to do a job. A new worker takes 5 hours. How long does it
take them if they work together?

Answer 1

time taken by a worker= 1/3 hours

time taken by the new worker= 1/5 hours

time taken to complete the work if they work together

= 1/3 + 1/5

= 5+3/15

=8/15

=15/8 hours