# Two people

Two straight lines cross at right angles. Two people start simultaneously at the point of intersection. John walking at the rate of 4 kph in one road, Jenelyn walking at the rate of 8 kph in the other road. How long will it take for them to be 20√5 km apart

**Result****Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):**

**Showing 1 comment:**

**Dr Math**

checkout also our speed/velocity calculator:

https://www.hackmath.net/en/calculator/conversion-of-speed-units?a=8+kph&submit=Convert&dir=0

https://www.hackmath.net/en/calculator/conversion-of-speed-units?a=8+kph&submit=Convert&dir=0

#### To solve this example are needed these knowledge from mathematics:

## Next similar examples:

- Vertices of RT

Show that the points P1 (5,0), P2 (2,1) & P3 (4,7) are the vertices of a right triangle. - Euclid2

In right triangle ABC with right angle at C is given side a=27 and height v=12. Calculate the perimeter of the triangle. - Distance

Wha is the distance between the origin and the point (18; 22)? - Medians and sides

Triangle ABC in the plane Oxy; are the coordinates of the points: A = 2.7 B = -4.3 C-6-1 Try calculate lengths of all medians and all sides. - Vector 7

Given vector OA(12,16) and vector OB(4,1). Find vector AB and vector |A|. - Unit vector 2D

Determine coordinates of unit vector to vector AB if A[-6; 8], B[-18; 10]. - ABS CN

Calculate the absolute value of complex number -15-29i. - Reference angle

Find the reference angle of each angle: - Theorem prove

We want to prove the sentense: If the natural number n is divisible by six, then n is divisible by three. From what assumption we started? - Line

Line p passing through A[-10, 6] and has direction vector v=(3, 2). Is point B[7, 30] on the line p? - Points collinear

Show that the point A(-1,3), B(3,2), C(11,0) are col-linear. - Vector - basic operations

There are given points A [-9; -2] B [2; 16] C [16; -2] and D [12; 18] a. Determine the coordinates of the vectors u=AB v=CD s=DB b. Calculate the sum of the vectors u + v c. Calculate difference of vectors u-v d. Determine the coordinates of the vector w. - Add vector

Given that P = (5, 8) and Q = (6, 9), find the component form and magnitude of vector PQ. - Calculation

How much is sum of square root of six and the square root of 225? - Coordinates of vector

Determine the coordinate of a vector u=CD if C(19;-7) and D(-16;-5) - Vector

Determine coordinates of the vector u=CD if C[19;-7], D[-16,-5]. - Square side

Calculate length of side square ABCD with vertex A[0, 0] if diagonal BD lies on line p: -4x -5 =0.