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:

t =  5 h

Step-by-step explanation:

v1=4 km/h v2=8 km/h  s=20 5=20 5 km44.7214 km  v=v12+v22=42+82=4 5 km/h8.9443 km/h  t=s/v=44.7214/8.9443=5 h



Did you find an error or inaccuracy? Feel free to write us. Thank you!



Showing 1 comment:




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.

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


 
We encourage you to watch this tutorial video on this math problem: video1   video2

Related math problems and questions: