Journey 9

A person covers half of his journey at 40 km/h and rest of his 20 km/h. Find his average speed of the whole journey.

Correct answer:

v =  26.6667 km/h

Step-by-step explanation:

v1=40 km/h v2=20 km/h  s1 = s/2 s2 = s/2  s1 = v1 t1 s2 = v2 t2  v = ts = t1+t2s1+s2  v = s1/v1+s2/v2s1+s2  v = s/2/v1+s/2/v2s/2+s/2  v=1/v1+1/v22=1/40+1/202=26.6667 km/h



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