Question 678489
Roger can complete a job in 5 hours and Alex can complete the same job in 10 hours.
 How many hours will it take both of them to complete the job if they work together?
:
Let t = time working together
Let the completed job = 1
;
{{{t/5}}} + {{{t/10}}} = 1
2t + t = 10
;
3t = 10
;
t = 10/3
;
t = 3{{{1/3}}} hrs