# 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 on the other road. How long will it take for them to be 20√5 km apart

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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 to related online calculators

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?

Pythagorean theorem is the base for the 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?

Pythagorean theorem is the base for the right triangle calculator.

See also our trigonometric triangle calculator.

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