Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes? `5/(11)` b. `6/(11)` c. `7/(11)` d. `8/(11)`

Options

A. `6//11`
B. `5//11`
C. `7//11`
D. `8//11`