Average speed

The truck drove 1/2 of the way on the highway at 80km/h. The other half of the way, 20km/h. Calculate the average speed

Correct answer:

v =  32 km/h

Step-by-step explanation:

v1=80 km/h v2=20 km/h  s1 = s2 = s/2  t1 = s1/v1 t2 = s2/v2 t = t1+t2  v = s/t = s / (s/2/v1 + s/2/v2)  v=2/(v11+v21)=2/(801+201)=32 km/h



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Showing 1 comment:
Duck10 Plays Yt
This is a Harmonic mean problem, 2ab/a+b will get you the answer.





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