Average speed

The car drove on one section of the highway for half an hour at a speed of 80 km/h. Then he reduced his speed to 60km/h. It went three-quarters of an hour at a speed of 60 km/h. What was the average speed of the car?

Correct answer:

v =  68 km/h

Step-by-step explanation:

v1=80 km/h t1=1/2=21=0.5 h  v2=60 km/h t2=3/4=43=0.75 h  s1=v1 t1=80 21=280 1=280=40 km s2=v2 t2=60 43=460 3=4180=45 km  v=t1+t2s1+s2=21+4340+45=68 km/h

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