# Two people

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

## Correct answer:

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**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

Tips for related online calculators

The line slope calculator is helpful for basic calculations in analytic geometry. The coordinates of two points in the plane calculate slope, normal and parametric line equation(s), slope, directional angle, direction vector, the length of the segment, intersections of the coordinate axes, etc.

Our vector sum calculator can add two vectors given by their magnitudes and by included angle.

Do you want to convert velocity (speed) units?

See also our right triangle calculator.

See also our trigonometric triangle calculator.

Our vector sum calculator can add two vectors given by their magnitudes and by included angle.

Do you want to convert velocity (speed) units?

See also our right triangle calculator.

See also our trigonometric triangle calculator.

#### You need to know the following knowledge to solve this word math problem:

**geometry**- analytic geometry
- line
- vector
**arithmetic**- square root
**planimetrics**- Pythagorean theorem
- right triangle
- triangle

#### Units of physical quantities:

#### Themes, topics:

#### Grade of the word problem:

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