One-third 18

One-third of a certain journey was covered at the speed of 20 km/h, one-fourth at 30 km/h, and the rest at the speed of 50 km/h. Find the average speed of the whole journey.

Correct answer:

v =  30 km/h

Step-by-step explanation:

v1=20 km/h v2=30 km/h v3=50 km/h  s1 = s/3 s2 = s/4 s3 = s  s1  s2 = fr(,5,12) s  v = ts =  s1/v1 + s2/v2+s3/v3s v =  (s/3)/v1 + (s/4)/v2+(5/12 s)/v3s  v=3 v11+4 v21+12 v351=3 201+4 301+12 5051=30 km/h



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