Avg velocity

A car travels 120 km at 60 km/hr and another 120 km at 40 km/hr. What is its average speed?

Correct answer:

v =  48 km/h

Step-by-step explanation:

s1=120 km v1=60 km/h  s2=s1=120 km v2=40 km/h  t1=s1/v1=120/60=2 h t2=s2/v2=120/40=3 h  t=t1+t2=2+3=5 h s=s1+s2=120+120=240 km  v=ts=5240=48 km/h



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