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Question

One car moving on a straight road covers one-third of the distance with 20km/hr and the rest with 60km/hr. The average speed is

A
36 km/hr
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B
80 km/hr
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C
40 km/hr
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D
4623 km/hr
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Solution

The correct option is A 36 km/hr

Given,
v1=20 km/hr
v2=60 km/hr
Let t1 is the time taken by initial (13)rd distance and t2 for remaining (23)rd distance.

Average speed=Total distancetotal time
vavg=xt1+t2
vavg=xx3v1+2x3v2=3v1v22v1+v2
vavg=3×20×602×20+60
=36 km/hr
Final Answer: (𝐃)

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