There are five inlet pipes (A, B, C, D and E) and five outlet pipes (P, Q, R, S and T) connected to a tank. The first pie - chart represents the percentage of the tank filled by each inlet pipe when all the inlet pipes are opened together and the second pie - chart represents the percentage of the tank emptied by each outlet pipe when all the outlet pipes are opened together.

Total capacity of the tank = 1000 litres

Time taken to fill the tank when all the inlet pipes are opened together = 2 minutes

Time taken to empty the tank when all the outlet pipes are opened together = 1.6 minutes