Answer:
9 Km/h
Step-by-step explanation:
Walking 3 Km for 20 minutes from the definition of speed, it's distance covered per unit time. Here, the distance covered is expressed per unit hour.

Substituting 3.5 Km for distance and time for 20 minutes
To convert time into hours, we divide the minutes by 60 hence time=20/60=1/3 hours

Therefore, the speed is 9 Km/h
Answer:

Step-by-step explanation:
Using the general equation
, we already know that
and
, but we need to find
from the period:

Hence, the cosine function is 
132..............................................
X+yz : is the answer to your question.
There are 4 quarts to a gallon, so take 4 and multiply that by 12, which will be 48. So the answer is 48 1- quart pails of water per day