Question

Two cars start moving from the same point. One travels south at 20 mi/h and the other travels west at 60 mi/h. At what rate is the distance between the cars increasing 3 hours later?

Answer 1

how much will their rate increase by after 3 hours?

Answer 2

after time t (in hours), the distance between the cars is given by Pythagorus as follows:\[d=\sqrt{(st)^2+(wt)^2}\]where s is the speed of the car travelling south and w is the speed pf the car travelling west.

Answer 3

does that make sense to you?