Directions: Two quantities A and B are given in the following questions. You have to find the value to both A and B by using your knowledge of mathematics and choose the most suitable relation between the magnitude of A and B from the given options.

X can fill a tank in 15 minutes, while Y can do the same in 20 minutes. Z can empty the tank in 24 minutes.

Quantity A - Time taken by X and Z to fill 3 / 4th of tank.

Quantity B - Time to fill the tank when all three pipes are employed.