Mathematics · Time and Work

Pipe A can fill a tank in (p - 5) hours, and Pipe B in (p + 5) hours. They are opened together for (p - 15) hours, after which Pipe A is closed and Pipe B finishes the remaining work in (t + 3) hours. Later, p litres of milk is mixed with (p/5) litres of water. This mixture is sold at the cost price of milk only. If the cost price of milk is Rs. 20 per litre, and the total revenue from selling the mixture is invested at (r + 2)% compound interest for 2 years, the total amount becomes Rs. 864. The ratio of the efficiency of Pipe A to Pipe B is 3:2. Quantity I: 9t Quantity II: r