Question

A car travels the first
20 km with a speed of 80 Km/h.
Find the average speed​

Answer 1

Answer:

The car travels the first 40 km at an average speed of 80 km/h, so it takes 40*60/80 = 30 minutes. The next 40 km is covered at an average speed of 40 km/h, so it takes 40*60/40 = 60 minutes. So 80 km are covered in 30+60 = 90 minutes or 1.5 hrs, so the average speed for the 80 km trip is 80/1.5 = 53.33 km/h.