Question 780901
Terry's rate = 1/1 job/hr
Pat's rate = 1/2 job/hr
Together rate = 1/x job/hr
1/1 + 1/2 = 1/x
Common denominator = 2x
2x + x = 2
3x = 2
x = 2/3
It will take them 40 minutes 
working together.
Hope this helps.
:-)