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Q.

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
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