N automóvil corre a 120 kilómetros por hora y otro a 80 kilómUetros por hora; si deben recorrer 960 kilómetros, ¿con cuántas horas de diferencia llega el primero del segundo?

4 hours

Step-by-step explanation:

Both cars here travel with uniform motion (constant velocity), so the relationship between distance covered, time taken and speed is:

where

t is the time taken

d is the distance covered

v is the speed of the car

Here we have:

(speed of the 1st car)

(speed of the 2nd car)

d = 960 km is the total distance covered by each car

So for car 1, the time taken is:

While for car 2, the time taken is:

And so, the difference in arrival time between the two cars is:

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.