Working independently San can complete a certain job in 5 hours and Diane can complete the same job in x hours. If working together Sam and Diane can complete the job in 3 hours, what is the value of x?
A. 20
B. 12
C. 8
D. 7.5
E. 4
The OA is D.
To solve this PS question, I tried the following,
1/5 + 1/x = 1/3
1/x + 1/3 - 1/5
1/x = 2/15
Therefore x = 15/2 = 7.5
Option D.
A. 20
B. 12
C. 8
D. 7.5
E. 4
The OA is D.
To solve this PS question, I tried the following,
1/5 + 1/x = 1/3
1/x + 1/3 - 1/5
1/x = 2/15
Therefore x = 15/2 = 7.5
Option D.
