Q. |
P, Q, and R together can complete a piece of work in 8 days. P alone can complete the work in 15 days, Q alone in 30 days. In how many days can R alone complete the work? |
|
A. 20 |
|
|
B. 30 |
|
|
C. 40 |
|
|
D. 50 |
Let the total work to be completed = 120 units (LCM of 8, 15 & 30)
In one day, thet together can do 120/8 = 15 units
In 1 day, P alone can complete 120/15 = 8 units
In 1 day, Q alone can complete 120/30 = 4 units
In 1 day, r alone can complete 15-(8+4) =3 units
To complete 120 units, they will take 120/3 = 40days
Sujit (November 18, 2021 at 19:49) said: