The average speed traveled by car is [tex]35m/s[/tex].
[tex]1^{st}[/tex] case
Distance [tex]=[/tex] [tex]speed*time= 50*20=1000m[/tex]
[tex]2^{nd}[/tex] case
- Speed[tex]=30m/s[/tex]
- Time[tex]=30s[/tex]
Distance[tex]=30*30=900m[/tex]
[tex]3^{rd}[/tex] case
- Speed[tex]=20m/s[/tex]
- Time[tex]=10s[/tex]
Distance[tex]=20*10=200m[/tex]
Now, The total distance[tex]=(1000+900+200)m=2100m[/tex]
Total time[tex]=(20+30+10)s=60s[/tex]
Average distance [tex]=\frac{total distance}{total time} = \frac{2100}{60}=35m/s[/tex]
To learn more about Average speed, refer to:
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