1. Working independently at their respective rate, pump X and Y took 48 minutes to fill an empty tank with water. what fraction of the water in the full tank came from pump X?
A. Working along at its constant rate, pump X would have taken 80 minutes to fill the tank with water
B. Working alone at its constant rate, pump Y would have taken 120 minutes to fill the tank
2. If K #0, 1 or -1 is 1/k >0
A. 1/k-1 >0