Tractor 17

The tractor has an average speed of 2.4 km/h in the first minute of starting, 3.6 km/h in the second and third minutes, and 5.0 km/h in the fourth to sixth minutes. What movement did it make during the first six minutes of driving? Determine the average speed of the tractor during this time.

Correct answer:

v =  4.1 km/h

Step-by-step explanation:

t1=1 min h=1:60  h=0.01667 h v1=2.4 km/h  t2=2 min h=2:60  h=0.03333 h v2=3.6 km/h  t3=3 min h=3:60  h=0.05 h v3=5.0 km/h  s1=v1 t1=2.4 0.0167=251=0.04 km s2=v2 t2=3.6 0.0333=253=0.12 km s3=v3 t3=5 0.05=41=0.25 km  s=s1+s2+s3=0.04+0.12+0.25=10041=0.41 km t=t1+t2+t3=0.0167+0.0333+0.05=101=0.1 h  v=ts=0.10.41=4.1 km/h



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