Answer:
60%
Step-by-step explanation:
15/25 = x/100
0.60 = x/100
0.60 * 100 = x
60 = x
25 * 60% = 15
See attachment for math work.
So, we can say that the new pump is 1 and the old pump is 1.5 less efficient as the new pump. With this, is we were to say two of the new pumps, it would be 5 hours. However, because one is an old pump it would be 7.5 hours
