If a car covers 2 km with a speed of 2 km/hr and 16 km with a speed of 8 km/hr. What will be the average speed of car?
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s1=2km
v1=2km/h
s2=16km
v2=8km/h
t1=s1/v1
t1=2/2
t1=1h
t2=s2/v2
t2=16/8
t2=2h
average speed=total distance/total time
=(s1+s2)/(t1+t2)
=(2+16)/(1+2)
=18/3
=6km/h
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