Because the specific metals aren’t mentioned in this inquiry. The educational guesses that we can propose is that: 
1. The hypothetical inquiry: There are existing metals for making pots that will cook food much faster. 
2. The one-tailed alternative hypothesis: There are other metals for making pots that will cook food much faster than the other metals. 
3. The one-tailed null hypothesis: All metals that are used in making pots will cook food at an equal rate.