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A car drives for an hour on the highway at a speed of 100 km/h, then for half an hour at a speed of 80 km/h, and for another half hour in the field at a speed of 20 km/h. What track did he run together? What is the average speed of the car?

Correct answer:

s =  150 km
v =  75 km/h

Step-by-step explanation:

v1=100 km/h t1=1 h v2=80 km/h t2=1/2=21=0.5 h v3=20 km/h t3=1/2=21=0.5 h  s1=v1 t1=100 1=100 km s2=v2 t2=80 0.5=40 km s3=v3 t3=20 0.5=10 km  s=s1+s2+s3=100+40+10=150 km
t=t1+t2+t3=1+0.5+0.5=2 h  v=ts=2150=75 km/h

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