Answer:
Average speed is [tex]96 km/h[/tex]
Step-by-step explanation:
Given: Total distance covered by Lorri is 240 km. For some distance his speed was 120 km/h and for the rest of the distance, speed is 80 km/h
To find: Average speed for the entire trip
Solution:
On her way to Waterloo:
Distance covered = 240 km
Speed = 120 km/h
Time = Distance /speed = [tex]\frac{240}{120} =2\,\,hours[/tex]
On her way to home:
Distance covered = 240 km
Speed = 80 km/h
Time = Distance /speed = [tex]\frac{240}{80}=3\,\,hours[/tex]
Total distance covered by Lurri = 240 + 240 = 480 km
Total time = [tex]2+3=5\,\,hours[/tex]
Average speed = Total distance/Total time taken = [tex]\frac{480}{5}=96\,\,km/h[/tex]
