Person 1 can do a certain job in fifteen minutes, and person 2 can do the same job in thirty minutes. When completing the job together, which expression would be used to represent the amount of work done by person 1?
A.1/15
B.x/15
C.15
pls asap
The detailed answer is Let time taken by first person =x So x = 15 Let time taken by next two persons be y So 2y=30 or y=15 So x= y = 15 Time taken = 1/x=1/y=1/15 Answer is a
