A car moving on a straight road covers one third of the total distance with a speed of 20 km/hr and the rest with a speed of 60 km/hr. The average speed is
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a
40 km/hr
b
80 km/hr
c
36 km/hr
d
4623 km/hr
answer is C.
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Detailed Solution
vave=st1+t2 where t1=s/3v1 and t2=2s/3v2 =3v1v22v1+v2 =3×20×60 2×20+60=36kmph