1 miles = 1609.344 m
1 hour = 60 min x 60 sec = 3600 s
30 miles 1 hr 1609.344 m
_______ x ______ x __________= 13.412m/s
1 hr 3600 s 1 miles
Inquiry; wanting to know. Thinking critically to figure out, understand. However being skeptic to not fall on one simple answer. For possibly, it could be incorrect.
Answer:
The correct answer is option D.
Explanation:
A fuel cell is defined as the electrochemical cell which converts the chemical energy of a fuel (often used hydrogen) and an oxidizing agent (often used oxygen) into electrical energy via a pair of redox reactions.
The reactions which occur in hydrogen-oxygen fuel cell are:
At cathode:
At anode: 
As we can see that reaction of hydrogen gas with oxygen gas gives us the water as a product which can be used for other things and it also doesn't pollutes environment.
Answer:
it is the moisture in the air
Explanation:
if we buy a dehumidephire we see that it collets water from the air