Answer:
The speed is still water is 
.
Step-by-step explanation:
Dimentionally speaking, speed is distance divided by time. Since, the person is travelling downstream, absolute speed is equal to the sum of current speed and speed of the person regarding current. Both components are constant. That is:
Where:
- Current speed, measured in miles per hour.
- Speed of the person regarding current, measured in miles per hour.
- Distance travelled downstream, measured in miles.
- Time spent on travelling, measured in hours.
Speed in still water occurs when current speed is zero. Then, such variable is obtained after subtracting current speed on both sides of the expression. Hence:
The speed is still water is .
B. 2 I believe that’s right
1 mm
Km etc
Hm etc
Dam etc
M 0.001
Dm 0.01
Cm 0.1
MM 1
The distance between the two points is 
The polar coordinate of A is 
The polar coordinate of B is 
Explanation:
The two points are 
and 
The distance between two points is given by,
Thus, the distance between the two points is
The polar coordinates of A can be written as 
Distance = 
Substituting , we get,
Distance = 
To make the angle positive, let us add 360,
The polar coordinate of A is
Similarly, The polar coordinate of B can be written as
Distance =
Substituting , we get,
Distance = 
To make the angle positive, let us add 360,
The polar coordinate of B is
