Question

A car travels 1/3 rd distance on a straight road with a velocity of 10 km/h next 1/3 rd
with velocity 20 km/h and last with a velocity 60 km/h. What is the average velocity
of the car in the whole journey?
(a) 4km/hr
(b) 6 km/hr.
(c) 12 km/hr.
(d) 18 km/hr

Answer 1

Answer:

I think that it could be a option b.....

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Answer 2

Answer:

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let distance to be covered is 1800.

then time taken for first 1/3 is T

1 = 10/600=60sec

time taken for second 1/3 is T1 = 20/600=30sectime taken for third 1/3 is T

1 =60/600 =10sectotal time taken is 100 sec.

an velocity is 100/1800 =18km/s.