Question 132056
Phil can do the 1/12 job in 1 hr.
Rick can do 1/10 job in 1 hr.
In 3 hours: 3/12 + 3/10
=15/60 + 18/60
=33/60=11/20 of the job is completed after 3 hrs.
.
Rick has to finish 9/20 of the job.
Let x be the number of hours required for Rick to complete the job.
x/10=9/20
x=90/20
x=4.5 hrs it will take Rick to finish the job alone.
.
Ed