Directions: The following question consists of three statements A, B and C. You have to determine which of the following statements is/are necessary to answer the question. At the Natural dairy farm in Halwara, milk from the milking parlour is pumped into a partially-filled collection tank at a constant rate through an inlet pipe. At the same time, milk is pumped out of the collection tank at a constant rate through an outlet pipe into the BMC for further processing. At what rate, in litres per minute, is the quantity of milk in the collection tank increasing? A. The quantity of milk initially in the tank is 200 litres. B. Milk is pumped into the tank at a rate of 10 litres per minute. C. Milk is pumped out of the tank at a rate of 10 litres every two and a half minutes.