An engineer traveled 130 mi by car and then an additional 690 mi
by plane. the rate of the plane was three times the rate of the
car. the total trip took 6 h. find the rate of the car.

60 mph

Step-by-step explanation:

Distance by car = 130 mi

Distance by plane = 690 mi

Total travel time = 6 h

R(p) = 3R(c)

The total travel time can be described by the following equation:

The rate of the car was 60 mph.

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)