Respuesta :
Answer:
average velocity 722 km/h
Explanation:
The average speed is defined with the total distance traveled between the total time, let's look for distance and time, we can use the equation
   V = X / t
 The first distance tells us that it travels ¼ of the total distance (X) at a speed (V1) of 650 km / h
   V1 = X1 / t1
  t1 = X1 / V1
  t1 = ¼ X / 650
The second distance runs ¾ of the total distance at V2 = 750 km / h
  V2 = X2 / t2
  t2 = X2 / V2
  t2 = ¾ X / 750
Total time is the sum of these times
  t all = t1 + t2
  t all = ¼ X / 650 + ¾ X / 750
  t all = X (1/2600 +3/3000)
  t all = X (1/2600 + 1/1000)
Let's calculate the average speed
  V = X / t
   V = X / X (1/2600 +0.001)
  V = 1 / 0.001385
  V = 722 km / h
