(1) if car a starts from a certain place at a speed of 60km / h, write down the distance S1 (km) and its speed A and B trucks are driving on a highway at a constant speed. (1) If car a starts from a certain place at a speed of 60km / h, write the functional relationship between its driving distance S1 (km) and its driving distance t (H), and draw his image. (2) if car B starts from the same place 2 hours after car a starts and drives along the same direction at a speed of 80km / h, its driving distance S2 (km) is also a function of the driving time t (H) after car a starts, write its driving distance S2 (km) (3) find out the coordinates of the intersection of two images, and explain the practical significance of the coordinates of the intersection
(1)s1=60t
(2)s2=80(t-2)
(3) Point of intersection
The roots of two equations
t=8
s=480
Where and when do two cars meet
Traveling between a and B, the speed from a to B is 45km / h, and the speed from a to B is 60km / h. It takes 2.1h to go back and forth
Ask a question and solve it by equation
What is the distance AB?
Let AB distance be x km
X/45+X/60=2.1
7X/180=2.1
X=54
The AB distance is 54 km