Answer:
The other rational number is
.
Step-by-step explanation:
First rational number is 
Let other rational number is 
The product of two rational numbers is 
According to question,

Multiplying both sides by (-3/2) such that,

So, the other rational number is
.
(3/4)/3
3/12
1/4
So he spent a 1/4 hour milking each group.
The formula for the volume of a cone is V= πr² (h/3).
V= 3.14 (12²) (8/3)
V= 3.14 (144) (2.6...)
V= 1205.76
V≈ 1206
So the answer is A.