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Question

A car travels 1/3 of the distance on a straight road with a velocity of 10 km/hour. next 1/3 with a velocity of 20 km/hour and the last 1/3 with velocity 60 km/h. The avg. velocity of the car in the whole journey is
  1. 18km/h
  2. 30km/h
  3. 36km/h
  4. 90km/h

A
18km/h
B
30km/h
C
90km/h
D
36km/h
Solution
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