Task: Question Answering
Input (English): Question: Two water pumps, working simultaneously at their respective constant rates, took exactly five hours to fill a certain swimming pool. If the constant rate of one pump was 1.5 times the constant rate of the other, how many hours would it have taken the faster pump to fill the pool if it had worked alone at its constant rate?

 Option A: 5

 Option B: 16/3

 Option C: 11/2

 Option D: 6

 Option E: 25/3
Output (English): Option E