A car travels 1/3 of the distance on a straight road with a velocity of 10km/h, next one-third with a velocity of 20km/h and the last one third with a velocity of 60km/h. Then the average velocity of the car (in km/h) during the whole journey is
20
18
30
15
A
15
B
18
C
20
D
30
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Solution
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vavg=TotalDistanceTotaltime
Total Distance =S
vavg=SS3×10+S3×20+S3×60
vavg=18m/sec
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