Answer:
<em>d</em> = or 8.60
Step-by-step explanation:
(5, 8) (-2, 3)
Let 5 =
8 =
-2 =
3 =
Plug in the values into the equation to get the distance:
<em>d = </em><em />
<em>d </em>=
<em>d = </em>
<em>d</em> =
<em>d = </em> or 8.60
Answer:
The rate of the current is 2 miles per hour.
Step-by-step explanation:
Let us assume that the rate of the river is v miles per hour.
The speed of the boat is 12 miles per hour.
Let us assume also that the boat can go 21 miles in t hours in the downstream and 15 miles upstream at the same time i.e. t hours.
So, from the condition given we can write that
......... (1), and
......... (2)
Now, adding those two equations we get
⇒ hours
Now, from equation (1), we get,
⇒ v = 2 miles per hour
Therefore, the rate of the current is 2 miles per hour. (Answer)
