Task: Question Answering
Input (English): Problem: two water pumps , working simultaneously at their respective constant rates , took exactly 5 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 slower pump to fill the pool if it had worked alone at its constant rate ? 
Options: a ) 8.5 , b ) 10.5 , c ) 12.5 , d ) 14.5 , e ) 16.5
Output (English): c