Answer:
- choice B
Step-by-step explanation:
Let c miles per hour be the rate of the river current. If the rate at which the boat travels in still water is 5 times the rate of the river current, then the rate of the boat is 5c miles per hour.
1. Upstream the rate of the boat is 5c-c=4c miles per hour. To overcome 12 miles upstream it is needed
2. Downstream the rate of the boat is 5c+c=6c miles per hour. To overcome 12 miles downstream it is needed
2. The total time is
If the excursion boat on the river takes 2½ hours to make the trip to a point 12 miles upstream and to return, then
Solve this equation:
This equation was obtained as
Simplifying
7x + -4y = 23
Solving
7x + -4y = 23
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '4y' to each side of the equation.
7x + -4y + 4y = 23 + 4y
Combine like terms: -4y + 4y = 0
7x + 0 = 23 + 4y
7x = 23 + 4y
Divide each side by '7'.
x = 3.285714286 + 0.5714285714y
Simplifying
x = 3.285714286 + 0.5714285714y
Answer:
(2,220)
Step-by-step explanation:
if you have any questions about the way I solved it, don't hesitate to ask
Answer:
20 m
Step-by-step explanation:
The area of a triangle is 120 sq m
The length is 60 m
We are required to find the breadth
Therefore to find the breadth of the traingle the formular below will be applied
Area= length × breadth
120= 60 × breadth
Breadth= 120/60
= 20 m
Hence the breadth of the traingle is 20 m
Yes, 40,25,85 is a Pythagorean triple
