What is the pumping rate, in L/Hour of each pump?

Question

Pump A delivers water at twice the rate of pump B. If both pumps operate together a tank of 18000 liters capacity can be filled in 3o minutes.

Answer 1

From the question we can say that the pumping rate of A = 2 * B;

Let's have a look at each pump's rate:

For pump B, let's assume the worst case as clearly it is the slower one out of the two pumps.

= So in 1/2 hours, pump B can pump (18000L / (1/2 hours)) = 36000 L / hour

For pump A, we know that it is twice as fast as pump B;

= A = 2 * B = 2 (36000 L / hour) = 72000 L / hour