A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at

an average speed of 40 km/h. The average speed of the car for this 80-km trip is:

Answer:53.3m/s

Explanation:

time for first travel

time=distance/speed

time=40/80

time=0.5seconds

time for second travel:

time=distance/speed

time=40/40

time=1seconds

total time=0.5+1

total time=1.5seconds

Then average speed for 80km trip:

Speed=distance/time

Speed=80/1.5

Speed=53.3m/s