3hr 24 min = hr = hours.

Let dAB = x and dBC = y.

.... (1)

Using :

.... (2)

Solve equations (1) and (2) simultaneously.

Edit:Equation (2) is wrong. It should be .... (2)

Fred flew from Point A to Point B at an average speed of 500km/h, and from Point B to Point C at an average speed of 600km/h. The total time in the air was 3h 24 min, and the total distance flown was 1920km. What is the distance between Point B and the other two points?